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Reviewed on Feb 27, 2018 , Ian Cumming, Mehdi Azzabi, Martin Leduc, Eric Bousquet

Dell U2515H
MONITOR REVIEW

Usage Ratings - Version 1.0

Test Benches: test

  • 1.0: Fall 2017
7.3
Mixed Usage
Score components:
  • 30% Office
  • 30% Multimedia
  • 25% Gaming
  • 10% Media Creation
  • 5% HDR Gaming
Size : 25 "
Resolution : 2560x1440
Refresh Rate : 60 Hz
LCD Type
What it is: Type of LCD technology used by the monitor.
When it matters: Different technologies have different viewing angle properties.
:
IPS
Variable Refresh Rate
What it is: Feature that allows the monitor to synchronize its refresh rate with the input device's output and reduces stuttering and screen tearing.
When it matters: Almost every usage, but is most noticeable in gaming where constant fluctuation in framerate cause distracting artifacts.
:
No

The Dell UltraSharp U2515H is a versatile IPS LCD monitor with wide viewing angles and decent picture quality. It gets bright, and it sits on a very good stand with a wide set of adjustments. It also remains accurate when viewed at an angle, which is great. Its main downside is the low contrast ratio and cloudy blacks.

Test Results
Design 7.5
Picture Quality 6.6
Motion 7.2
Inputs 8.6
Pros
  • Flexible stand with a wide range of adjustments
  • Wide viewing angles
Cons
  • Low contrast ratio
  • Cloudy blacks with lots of bleed and glow

Check Price

7.5

Design

Score components: Subjectively assigned
Dell U2515H Design Picture
Curved : No
Curve radius : N/A
Weight (without stand) : 9.6lbs (4.4 kg)
Weight (with stand) : 12.6lbs (5.7 kg)

The design of the Dell U2515H is good and the monitor looks very professional. It looks very similar to most other Dell monitors with a rectangular stand that provides good support with a relatively small footprint. It is also possible to rotate, swivel and tilt the monitor to suit.

Stand
Dell U2515H Stand picture
Width : 9.6" (24.5 cm)
Depth : 8.1" (20.5 cm)

The familiar Dell stand has a small rectangular footprint which supports the monitor well. It has a gap at the rear of the stand for cable routing, which is good.

8.0 Ergonomics
What it is: How much the position of the screen can be adjusted to match the viewing preference of the user.
When it matters: All usages, but especially office and gaming use.
Score components:
  • 46% Height Adjustment
  • 18% Switch portrait/landscape
  • 18% Swivel Range
  • 18% Tilt Range
Dell U2515H Ergonomics picture
Height Adjustment : 4.4" (11.2 cm)
Switch portrait/landscape : Yes
Swivel Range : -45° to 45°
Tilt Range : -20° to 5°

Like most other Dell monitors, the Dell U2515 has a wide range of ergonomic adjustments. The monitor can swivel, pivot and tilt which is great, but the height adjustment range may be a bit limiting for some people.

Back
Dell U2515H Back picture
Wall Mount : VESA 100x100

The rear of the Dell Ultrasharp U2515H is quite simple but looks good. There is a gap at the rear of the stand for cable management as shown here.

Borders
Dell U2515H Borders picture
Borders : 0.3" (0.7 cm)

The borders of the Dell Ultrasharp U2515H monitor are thin and look good, with only a small gap between the border and the screen.

Thickness
Dell U2515H Thickness picture
Thickness (with stand) : 5.8" (14.8 cm)
Thickness (without stand) : 1.8" (4.6 cm)

When viewed from the side, the monitor is quite thin. The stand doesn't extend too far behind the monitor so it can be placed quite close to a wall.

7.5 Build Quality
What it is: How well built and sturdy the monitor is, and how good the materials used to build it are.
When it matters: All usages.
Score components: Subjectively assigned
Dell U2515H Build Quality picture

The build quality of this Dell monitor is good. Although almost entirely plastic, it feels well constructed and professional.

The Dell Ultrasharp U2515H monitor has an average picture quality. The mediocre contrast ratio and awful black uniformity result in a sub-par experience when the monitor is used in a dark room, as blacks look gray and dark scenes look washed out. Fortunately, when the monitor is used in a bright environment like an office space, the monitor can get bright enough to fight glare and can deal decently with reflections. Gray uniformity is excellent and dirty screen effect is not a problem on this monitor.

Viewing angles are good and picture quality remains the same even if you look at the monitor from a sharp angle. Out of the box, the monitor's accuracy is great and even better when calibrated and covers the sRGB standard well. The monitor does not have more advanced features like HDR and local dimming, but it offers great performance for office work or home use.

6.3 Contrast
What it is: Brightness difference between white and black. This is the main component of picture quality.
When it matters: Always, but especially when watching dark scenes.
Score components:
Dell U2515H Checkerboard Picture
Native Contrast
What it is: Ratio of the white brightness divided by the blacks measured on our checkerboard test pattern with a white target of 100 cd/m².
When it matters: Dark scenes in a dark room.
Good value: > 3,000
Noticeable difference: 500
:
1209 : 1
Contrast with local dimming
What it is: Ratio of the white brightness divided by the blacks measured on our checkerboard test pattern with local dimming turned on (maximum) with a white target of 100 cd/m².
When it matters: Dark scenes in a dark room.
Good value: > 3,000
Noticeable difference: 500
:
N/A

The monitor has a mediocre contrast ratio, but relatively good for an IPS monitor. As with other IPS monitors, dark room performance is sub-par, as blacks tend to look more gray than really black when viewed in the dark. When used in a brighter room, like an office, the Dell Ultrasharp U2515H is a much better performer and is on par with the bigger U2715H, as both have almost the same contrast ratio.

0 Local Dimming
What it is: The lights behind the LCD layer adapt to the picture displayed, improving the contrast ratio.
When it matters: Dark scenes viewed in a dark room.
Score components: Subjectively assigned
Local Dimming
What it is: Whether it has a feature that controls the LEDs behind the LCD layer, to match the picture and darkens the dark portion of it.
When it matters: On LED TVs only. Dark scenes viewed in a dark room.
:
No
Backlight
What it is: Configuration of the lights of the backlight.
When it matters: Effectiveness of the local dimming.
Good value: Full-array/direct lighting is better for local dimming. As for the uniformity of the screen, it depends on the implementation. Some edge-lit monitors have more uniform blacks than some full-array monitors.
:
Edge

The Dell U2515H does not have a local dimming feature. The video is for reference only.
Update 08/31/2018: Corrected the backlight from 'Direct' to 'Edge' lighting.

8.1 SDR Peak Brightness
What it is: How bright the screen can get. Measured with local dimming and with SDR content.
When it matters: Bright living rooms; bright objects; SDR content.
SDR Real Scene
What it is: The maximum luminosity the TV can obtain while playing a movie or while watching a TV show. Our Real Scene was selected to represent a more regular movie condition. All measurements are made with the TV set to be as bright as possible, but with a 6500k white. Measured with local dimming on, max backlight and with an SDR signal. Scene: here.
When it matters: When watching movies and TV shows in SDR.
:
367 cd/m²
SDR Peak 2% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 2% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright highlights, present on screen for a short time
:
382 cd/m²
SDR Peak 10% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 10% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright objects, present on screen for a short time
:
384 cd/m²
SDR Peak 25% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 25% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
384 cd/m²
SDR Peak 50% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 50% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
383 cd/m²
SDR Peak 100% Window
What it is: The maximum luminosity, even if only maintained for a short time, of a white square covering 100% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
382 cd/m²
SDR Sustained 2% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 2% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright highlights, persistent during a scene.
:
382 cd/m²
SDR Sustained 10% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 10% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: Bright objects, persistent during a scene.
:
384 cd/m²
SDR Sustained 25% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 25% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
384 cd/m²
SDR Sustained 50% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 50% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
383 cd/m²
SDR Sustained 100% Window
What it is: The lowest maximum luminosity (usually after it has stabilized) of a white square covering 100% of the screen, with the monitor set to be as bright as possible. Measured with local dimming and over SDR signal.
When it matters: When watching in a bright room.
:
381 cd/m²
SDR ABL
What it is: The standard deviation of the SDR sustained brightness, after linearizing for noticeable differences in luminosity
When it matters: Content with large bright areas, such as for PC or video game use, and sports such as hockey
:
0.0

This Dell monitor's brightness is great. It gets bright enough for almost every environment, regardless of the average picture level or time.

0 HDR Peak Brightness
What it is: How bright the screen can get. Measured with local dimming and with HDR content.
When it matters: HDR content
HDR Real Scene : N/A
HDR Peak 2% Window : N/A
HDR Peak 10% Window : N/A
HDR Peak 25% Window : N/A
HDR Peak 50% Window : N/A
HDR Peak 100% Window : N/A
HDR Sustained 2% Window : N/A
HDR Sustained 10% Window : N/A
HDR Sustained 25% Window : N/A
HDR Sustained 50% Window : N/A
HDR Sustained 100% Window : N/A
HDR ABL : N/A

HDR is not supported.

7.3 Horizontal Viewing Angle
What it is: Color accuracy when viewed from the side.
Dell U2515H Horizontal Color Shift Picture
Color Shift from Left
What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your left
Good value: > 50°
Noticeable difference: 10°
:
40 °
Color Shift from Right
What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right
Good value: > 50°
Noticeable difference: 10°
:
35 °
Dell U2515H Horizontal Brightness Picture
Brightness from Left
What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your left.
Good value: > 50°
Noticeable difference: 10°
:
52 °
Brightness from Right
What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right.
Good value: > 50°
Noticeable difference: 10°
:
45 °
Dell U2515H Horizontal Black Level Picture
Black Level from Left
What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right.
Good value: > 50°
Noticeable difference: 10°
:
75 °
Black Level from Right
What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When sharing your monitor with people on your right.
Good value: > 50°
Noticeable difference: 10°
:
75 °
Curve Radius : N/A

Decently wide horizontal viewing angles. As is common with most IPS type LCD monitors, the Dell Ultrasharp U2515H maintains its picture quality quite well at an angle. Most notable are the blacks which don't shift significantly when viewed from an angle.

6.2 Vertical Viewing Angle
What it is: Color accuracy when viewed from the top or bottom.
Dell U2515H Vertical Color Shift Picture
Color Shift from Below
What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor from below.
Good value: > 50°
Noticeable difference: 10°
:
25 °
Color Shift from Above
What it is: Angle where the colors noticeable shift compared to when viewed from directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor when standing up.
Good value: > 50°
Noticeable difference: 10°
:
30 °
Dell U2515H Vertical Brightness Picture
Brightness from Below
What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor from below.
Good value: > 50°
Noticeable difference: 10°
:
34 °
Brightness from Above
What it is: Angle where the brightness drops to 50% of the brightness directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor while standing up.
Good value: > 50°
Noticeable difference: 10°
:
38 °
Dell U2515H Vertical Black Level Picture
Black Level from Below
What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor from below.
Good value: > 50°
Noticeable difference: 10°
:
19 °
Black Level from Above
What it is: Angle where the black level drops to 50% of the black level directly in front of the monitor. 0 ° means directly facing the monitor. Measurements are up to a maximum of 75 °.
When it matters: When looking at a monitor while standing up.
Good value: > 50°
Noticeable difference: 10°
:
27 °

Passable vertical viewing angle. The U2515H's colors and brightness shift only slightly faster than horizontally giving it a relatively large sweet spot. However, the blacks shift significantly more. This is possibly part of the excessive clouding shown in our black uniformity test.

8.7 Gray Uniformity
What it is: Evenness of colors onscreen (not just gray).
When it matters: Solid colors. Sports, panning shots.
Score components:
Dell U2515H 50% Uniformity Picture
50% Std. Dev.
What it is: Average squared difference of pixels when displaying a mid 50% gray.
When it matters: Solid colors. Sports, panning shots.
Good value: < 2.5%
Noticeable difference: 1%
:
2.25 %
50% DSE
What it is: High-frequency variance of uniformity. Dark spots on the screen.
When it matters: Solid colors. Sports, panning shots.
Good value: < 0.165%
Noticeable difference: 0.025%
:
0.118 %
Dell U2515H 5% Uniformity Picture
5% Std. Dev.
What it is: Average squared difference of pixels when displaying a mid 5% gray.
When it matters: Dark scenes.
Good value: < 1.15%
Noticeable difference: 1%
:
0.461 %
5% DSE
What it is: High-frequency variance of uniformity. Dark spots on the screen.
When it matters: Dark scenes.
Good value: < 0.116%
:
0.047 %

The gray uniformity of the Dell Ultrasharp U2515H is remarkable. Looking at the 50% test picture, we can see that the 4 corners are a bit darker than the rest, and we can also notice a slightly warmer patch near the center of the screen. Overall, these uniformity issues are really faint and do not cause any dirty screen effect which is great for browsing the web or viewing videos.

Looking at the 5% gray test uniformity picture, we can see in in the top left corner some backlight bleed which is also visible on the black uniformity picture. Other than this though, the screen is uniform which is good for viewing dark scenes in a dark room.

2.2 Black Uniformity
What it is: Evenness of blacks.
When it matters: Dark scenes viewed in a dark room.
Score components:
Dell U2515H Native Black Uniformity Picture
Native Std. Dev.
What it is: Average of the squared difference of the blacks.
When it matters: Dark scenes viewed in a dark room.
Good value: <2%
Noticeable difference: 1%, but keep in mind that it varies a lot by unit, even of the same model; yours likely will not end up exactly like ours.
:
4.525 %
Std. Dev. w/ L.D.
What it is: Average of the squared difference of the blacks with Local Dimming enabled
When it matters: Dark scenes viewed in a dark room.
Good value: <2%
Noticeable difference: 1%, but keep in mind that it varies a lot by unit, even of the same model; yours likely will not end up exactly like ours.
:
N/A

The Dell U2515H has a terrible black uniformity. Backlight bleed is prominent in the top left corner, but also around the edges near it. Some flashlighting is also visible near the bottom right corner. Overall, this results in a worse dark scene performance as the blacks appear blotchy.

8.1 Pre Calibration
What it is: Monitor's color accuracy before a full calibration. The measurements are taken with out of the box 'factory setting'.
When it matters: All video on an uncalibrated TV. This represents most people's use cases.
Score components:
Dell U2515H Pre Calibration Picture Dell U2515H Pre Gamma Curve Picture Dell U2515H Pre Color Picture
Picture Mode
What it is: The picture mode that was used to do the pre-calibration reading. We usually go for the picture mode that gives us the more control over all the picture quality setting.
:
Standard
Luminance
What it is: The luminance at which the pre-calibration reading was done. This represents the luminance of the monitor when it is at the factory default settings.
:
266 cd/m²
Luminance Settings
What it is: The luminance settings, often named 'Brightness' on monitors, usually range from 0 to 100.
:
50
Contrast Setting
What it is: The monitor contrast setting, usually ranging from 0 to 100.
:
50
RGB controls
What it is: This is the value for each color (red, green, and blue) used in the monitor internal RGB cuts/gains controls. If the monitor does not have an internal RGB cuts/gains controls, then the color temperature setting will be used instead, and the color temperature that gives us the best result will be used.
:
100-100-100
Color Temperature
What it is: The color temperature is a measure of the color of light. A colder color temperature (7000K) will look bluer and a warmer color temperature (4000K) will look yellower/redder. 6500K is the standard color for PC monitors and also for the sRGB color standard.
When it matters: When you care about color reproduction and accuracy.
Good value: 6500K
Noticeable difference: 400K
:
6319 K
White Balance dE
What it is: Average inaccuracy of shades of gray.
When it matters: Overall color temperature of all video.
Good value: < 3
Noticeable difference: 1
:
2.80
Color dE
What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
1.97
Gamma
What it is: Brightness of shades of gray.
When it matters: Shadows.
Good value: Between 2.1 and 2.3 (our target is 2.2)
Noticeable difference: 0.1
:
2.24

Out of the box, the U2515H monitor has a great accuracy, that is when set on to the 'Standard' picture mode ('Custom color' and 'Multimedia' are also reasonably accurate). The white balance dE and color dE are below the limit were the inaccuracy become apparent to most enthusiasts, which is good for people who do not intend to calibrate their new monitor. The gamma is not far from our 2.2 target and looking at the curve, we see that it does not deviate too much from the target curve. Finally, the color temperature is not too far from our 6500K target. Overall, this monitor could be used by most people without any calibration, which is good.

9.7 Post Calibration
What it is: Monitor's color accuracy after a full calibration with a spectrophotometer.
When it matters: All graphics and video content on a monitor that has been professionally calibrated.
Score components:
Dell U2515H Post Calibration Picture Dell U2515H Post Gamma Curve Picture Dell U2515H Post Color Picture
Picture Mode
What it is: The picture mode that was used to do the calibration reading. We usually go for the picture mode that gives us the more control over all the picture quality setting.
:
Custom Color
Luminance
What it is: The luminance at which the calibration was executed. We aim for a luminance level of 100 cd/m².
:
102 cd/m²
Luminance Settings
What it is: The luminance settings, often named 'Brightness' on monitors, usually range from 0 to 100.
:
15
Contrast Setting
What it is: The monitor contrast setting, usually ranging from 0 to 100.
:
55
RGB controls
What it is: This is the value for each color (red, green, and blue) used in the monitor internal RGB cuts/gains controls. If the monitor does not have an internal RGB cuts/gains controls, then the color temperature setting will be used instead, and the color temperature that gives us the best result will be used.
:
96-97-99
Color Temperature
What it is: The color temperature is a measure of the color of light. A colder color temperature (7000K) will look bluer and a warmer color temperature (4000K) will look yellower/redder. 6500K is the standard color for PC monitors and also for the sRGB color standard.
When it matters: When you care about color reproduction and accuracy.
Good value: 6500K
Noticeable difference: 400K
:
6458 K
White Balance dE
What it is: Average inaccuracy of shades of gray.
When it matters: Overall color temperature of all videos.
Good value: < 3
Noticeable difference: 1
:
0.56
Color dE
What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
0.40
Gamma
What it is: Brightness of shades of gray.
When it matters: Shadows.
Good value: Between 2.1 and 2.3 (our target is 2.2)
Noticeable difference: 0.1
:
2.19

After calibration, the accuracy of the Dell Ultrasharp U2515H is remarkable. Both the white balance dE and color dE are around 0.5, which is by any means, almost unnoticeable. To do the calibration, we used the 'Custom Color' picture mode, as it is this mode that allowed us to change the monitor RGB balance. The gamma curve was also corrected slightly to match more closely the target curve, and the overall value is now a bit closer to our 2.2 target. As for the color temperature, after calibration, it was much closer to our 6500k target.

You can download our ICC profile calibration here.

8.7 SDR Color Gamut
What it is: The palette of colors the monitor can display
When it matters: General content consumption or production
Score components:
Dell U2515H Color Gamut s.RGB Picture
s.RGB xy
What it is: Coverage of the s.RGB colorspace on CIE 1931 xy.
When it matters: Almost all content. Includes websites, standard windows environment and SDR movies
Good value: > 95%
Noticeable difference: 5%
:
99.5 %
Dell U2515H Color Gamut ARGB Picture
Adobe RGB xy
What it is: Coverage of the Adobe RGB colorspace on CIE 1931 xy.
When it matters: Professional photography.
Good value: > 90%
Noticeable difference: 5%
:
75.3 %

The Dell U2515H has no issues covering the standard RGB color gamut almost perfectly. Unfortunately, its reproduction of the wider Adobe RGB gamut is not sufficient for more professional use.

8.7 SDR Color Volume
What it is: How much of the SDR color spaces the monitor can reproduce
When it matters: General usage and SDR media creation
Score components:
Dell U2515H s.RGB Color Volume ITP picture
s.RGB in ICtCp
What it is: How much of the s.RGB colorspace a monitor can display at different luminosity levels
When it matters: Most content, including web, SDR video games, and SDR media creation
:
94.8 %
Dell U2515H Adobe RGB Color Volume ITP Picture
Adobe RGB in ICtCp
What it is: How much of the Adobe RGB colorspace a monitor can display at different luminosity levels, normalized to the monitor's peak brightness.
When it matters: Professional media creation
:
78.9 %

Good coverage of SDR color volumes. The volume matches its color gamut performance. As is common with most monitors, the Dell Ultrasharp U2515H cannot display darker tones due to its low contrast ratio.

0 HDR Color Gamut
What it is: The monitor's ability to reproduce HDR color spaces
When it matters: HDR content consumption or media creation
Score components:
Wide Color Gamut
What it is: Whether the monitor can support wider color gamuts
When it matters: HDR content and media creation
:
No
DCI P3 xy
What it is: Coverage of the DCI P3 colorspace on CIE 1931 xy
When it matters: When consuming or producing HDR content.
:
N/A
Rec. 2020 xy
What it is: Coverage of the Rec.2020 colorspace on CIE 1931 xy.
When it matters: When consuming or producing HDR content.
Good value: > 90%
Noticeable difference: 5%
:
N/A

The monitor does not support HDR color gamuts.

0 HDR Color Volume
What it is: How much of the HDR color spaces a monitor can display at different luminosity levels.
When it matters: HDR content consumption and production. Includes streaming services, UHD Blu-rays and HDR games.
Score components:
DCI-P3 in ICtCp
What it is: How much of the DCI-P3 colorspace a monitor can display at different luminosity levels, normalized to the monitor's peak brightness output.
When it matters: HDR content.
Good value: 80%
Noticeable difference: 5%
:
N/A
Rec. 2020 in ICtCp
What it is: How much of the Rec. 2020 colorspace a monitor can display at different luminosity levels, normalized to the monitor's peak brightness output.
When it matters: HDR content.
Good value: 80 %
Noticeable difference: 5 %
:
N/A

The monitor does not support HDR color gamuts.

10 Image Retention
What it is: How much a static image is retained on a monitor screen after a certain amount of time.
When it matters: When working or playing video games on your PC monitor.
Dell U2515H Image Retention Picture
IR after 0 min recovery
What it is: Image retention measured right after the static image exposure, without recovery time.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0 %
IR after 2 min recovery
What it is: Image retention measured after a recovery time of 2 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect
Noticeable difference: 0.015%
:
0 %
IR after 4 min recovery
What it is: Image retention measured after a recovery time of 4 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0 %
IR after 6 min recovery
What it is: Image retention measured after a recovery time of 6 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0 %
IR after 8 min recovery
What it is: Image retention measured after a recovery time of 8 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0 %
IR after 10 min recovery
What it is: Image retention measured after a recovery time of 10 minutes.
When it matters: When changing use or right after changing the type of on screen content (i.e. stopping playing video game to watch a movie).
Good value: 0 is perfect.
Noticeable difference: 0.015%
:
0 %

The Dell U2515H is not prone to image retention, as our test indicates, and is in line with the result that we had with the U2715H.

8.1 Gradient
What it is: How finely levels of color can be displayed.
When it matters: Details in shadows, sky and skin tones. Matters more for HDR content.
Score components: Subjectively assigned
Dell U2515H Gradient Picture
Color Depth
What it is: Number of bits per pixel to represent a specific color. Note: we consider 8-bit with dithering to be equivalent to 10-bit, as long as the 10-bit gradient looks smooth.
When it matters: HDR content like HDR video games or HDR UHD movies. Won't matter for regular Blu-ray movies, SDR video game or desktop environment content displayed from a Windows PC. Those are limited to 8-bit color.
Good value: 10-bit.
Noticeable difference: 1 bit.
:
8 Bit

The Dell Ultrasharp U2515H can display our gradient test image very well, as not much color tone issues can be noticed, besides the 8-bit banding due too the limitation of this monitor. Overall, this is a great performance, and the small problems are not enough to cause visible banding while watching regular content.

10 Color Bleed
What it is: How much the color from one area of the screen affects the color in another area of the screen.
When it matters: All usages, but especially media creation.
Score components:
Dell U2515H Color bleed horizontal
Pixel row error
What it is: The amount of bleed that appears across the screen horizontally.
When it matters: General usage of a PC monitor, can appear when browsing the web or with media creation like graphics.
Good value: <0.2%
Noticeable difference: 0.1%
:
0.000 %
Dell U2515H Color bleed vertical
Pixel column error
What it is: Amount of color bleeding that appears across the screen vertically.
When it matters: Most uses of a PC monitor. Can appear while browsing the web or when editing images or graphics.
Good value: <0.2%
Noticeable difference: 0.1%
:
0.000 %

Thankfully, the monitor does not produce any color bleed when showing large stripes of uniform colors.

7.5 Reflections
What it is: How much light is reflected by the TV.
When it matters: Bright rooms.
Score components: Subjectively assigned
Dell U2515H Average room Dell U2515H Average room off picture Dell U2515H Bright room off picture

The reflection handling is good. The light matte coating diffuses reflections across the screen, which helps to reduce their intensity. This is fine for an average room but may be distracting in a bright room.

7.2

Motion

Score components:

Motion looks decent on the Dell Ultrasharp U2515H, but not as good as on many gaming monitors. It has fast pixel response time and a flicker-free backlight, but its fixed 60 Hz refresh rate is only average for most usages, and only mediocre for gaming.

8.6 Motion Blur
What it is: The performance of the pixel response time. Poor response time causes trails to follow moving objects. Response time is one of a few sources of motion blur.
When it matters: When there's fast movement on screen, such as during video games and sports.
Score components:
Dell U2515H Motion Blur Picture Dell U2515H Response Time Chart
80% Response Time
What it is: How quickly pixels can reach 80% of a full transition from one color to another.
When it matters: When there's fast movement on screen, such as during video games and sports.
Good value: < 8 ms
Noticeable difference: 4 ms
:
4.4 ms
100% Response Time
What it is: How quickly pixels can fully transition from one color to another.
When it matters: When there's fast movement on screen, such as during video games and sports.
Good value: < 20 ms
Noticeable difference: 10 ms
:
15.9 ms
Best Overdrive Setting
What it is: If the monitor has adjustable pixel overdrive settings, which one produces the best response time with minimal overshoot.
When it matters: When adjusting the monitor's settings to get the least possible motion blur.
:
Normal

Response Time Normal
Response Time Fast

Very fast response time, which is great for viewing fast motion such as sports, games, or even browsing web pages. The ghosting trail following the logo is very short and hard to notice, which is great and most of the blur in the photo is due to 60 fps persistence. 'Response Time Normal' is the most balanced overdrive setting; the 'Fast' setting is a little faster but adds significantly more overshoot. Those who don't mind overshoot artifacts may prefer the 'Fast' setting, but most people will be better served by 'Normal'.

7.5 Image Flicker
What it is: Luminosity pattern when displaying images
When it matters: Nearly all the time during PC monitor use, but especially during fast movement such as video games
Dell U2515H Backlight Picture
Flicker-free : Yes
PWM Dimming Frequency
What it is: Flickering pattern at different luminosities.
When it matters: For people sensitive to flickering.
Good value: N/A or high frequencies (> 300 Hz). Frequencies that are multiples of 60Hz are better.
:
0 Hz
Black Frame Insertion (BFI)
What it is: Option to turn screen black between frames
When it matters: Reduces eye tracking blur in motion
Good value: Yes
:
No
BFI Maximum Frequency
What it is: Highest possible frequency of flickering pattern
When it matters: Reduces eye-tracking blur in motion
Good value: Matches the native refresh rate
Noticeable difference: 20 Hz
:
N/A
BFI Minimum Frequency
What it is: Lowest possible frequency of flickering pattern
When it matters: Reduces eye-tracking blur in motion
Good value: 60 Hz
Noticeable difference: 20 Hz
:
N/A

The Dell Ultrasharp U2515H monitor has a flicker-free backlight and does not use PWM to dim, which is excellent as it results in smooth motion. The monitor lacks a black frame insertion feature, which is unfortunate as introducing flicker can help to clear up blur due to image persistence with fast paced content. This is a common result though for 60 Hz monitors as many people find 60 Hz flicker bothersome.

6.7 Refresh Rate
What it is: How frequently the monitor can refresh and show new frames, and whether it can vary its refresh rate in real time using technologies like G-sync and FreeSync.
When it matters: Mostly for gaming, but does provide a little better motion during normal usage.
Native
What it is: The frequency at which the monitor is capable of displaying images every second
When it matters: General usage, but better results are most important for gaming
Good value: >100 Hz
Noticeable difference: 15 Hz
:
60 Hz
Factory Overclock
What it is: The frequency at which the monitor's can be boosted to using its internal menu.
When it matters: Gaming and other usages where high frame rate content is consumed.
Good value: >100
Noticeable difference: 15
:
N/A
Variable Refresh Rate
What it is: Feature that allows the monitor to synchronize its refresh rate with the input device's output and reduces stuttering and screen tearing.
When it matters: Almost every usage, but is most noticeable in gaming where constant fluctuation in framerate cause distracting artifacts.
:
No
VRR Maximum
What it is: The maximum frequency covered by the Variable Refresh Rate feature of the monitor.
When it matters: Any time the VRR feature is enabled.
Good value: Matches Refresh rate
Noticeable difference: 10 Hz
:
N/A
VRR Minimum
What it is: The lowest frequency covered by the monitor's Variable Refresh Rate feature.
When it matters: When using the VRR feature of the monitor at lower frame rates.
Good value: 30 Hz
:
N/A
VRR Maximum With OC
What it is: The maximum frequency covered by the Variable Refresh Rate feature when the monitor's overclocking feature is used.
When it matters: When both the overclocking and VRR features are used.
Good value: Matching the overclocked refresh rate.
Noticeable difference: 10 hz
:
N/A
VRR Supported Connectors : N/A

The Dell Ultrasharp U2515H monitor only has a very common 60 Hz refresh rate and lacks a variable refresh rate feature like FreeSync. This is good enough for most usages, but all usages would benefit from a higher refresh rate. For gaming, in particular, this refresh rate is only mediocre.

8.6

Inputs

Score components:

The Dell U2515H has a sharp 1440p resolution and an ordinary 25" size, which should still be great for most usages. It also has very low input lag, which will please all but the most competitive gamers.

8.8 Input Lag
What it is: Delay between input and onscreen reaction.
When it matters: General usage of the mouse and gaming.
Native Resolution
What it is: Lowest input lag possible at the center of the screen, when the monitor is displaying its native resolution at its native refresh rate.
When it matters: General usage and while playing video games.
Good value: < 15 ms
Noticeable difference: 5 ms
:
9.9 ms
Non-Native Resolution
What it is:

Lowest input lag possible at the center of the screen, when the monitor is displaying an alternative resolution at its native refresh rate. The non-native resolution tested depends on the native resolution of the monitor, following this pattern unless otherwise specified in the Input Lag text:

Native Resolution Non-Native Resolution Tested
4k UHD QHD
QHD FHD
FHD 1600x900
3440x1440 2560x1080
2560x1080 1920x1080
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
10.2 ms
Native Resolution @ 60 Hz
What it is: Lowest input lag possible at the center of the screen, when the monitor is displaying its native resolution at a refresh rate of 60 Hz.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
9.9 ms
Variable Refresh Rate
What it is: Lowest input lag possible at the center of the screen, when the monitor is using its Variable Refresh Rate feature at its native resolution.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
N/A
HDR
What it is: Lowest input lag possible at the center of the screen, when the monitor is displaying an HDR signal at its native resolution and refresh rate.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
N/A
Black Frame Insertion (BFI)
What it is: Lowest input lag possible at the center of the screen, when BFI is enabled and the monitor is displaying a signal at the highest supported BFI refresh rate.
When it matters: General usage as well as gaming.
Good value: < 15 ms
Noticeable difference: 5 ms
:
N/A

Great low input lag, which will please all but the most competitive gamers. The input lag for non-native resolutions is the same as normal, which is good.

8.3 Resolution and Size
What it is: The number of pixels the monitor can display, and the surface area of its screen.
When it matters: All usages, but especially for office and media editing.
Score components:
Native Resolution : QHD, 2560 x 1440
Aspect Ratio : 16:9
Megapixels : 3.7 MP
Pixel Density : 118 PPI
Screen Diagonal : 25.0 inches
Screen Area : 266 sq inches

The Dell Ultrasharp U2515H monitor has a sharp 1440p resolution but only an ordinary 25" size, being not quite as large as its big brother the U2715H. Still, this resolution and size will be great for most usages.

Inputs
Dell U2515H Inputs 1

All the monitor's inputs are on the back.

Total Inputs
DisplayPort : 1 (DP 1.2)
Mini DisplayPort : 1 (DP 1.2)
HDMI : 2 (HDMI 1.4)
DVI : No
VGA : No
DisplayPort Out : 1 (DP 1.2)
USB : 4 (USB 3.0)
USB C : No
Analog Audio Out 3.5mm : 1
Microphone In 3.5mm : No
Digital Optical Audio Out : No
Analog Audio Out RCA : No

The monitor has a DisplayPort Out for daisy chaining with another monitor, which allows both monitors to be fed from one DisplayPort on a computer. The monitor's HDMI ports support MHL.

Features

The Dell Ultrasharp U2515H has all the standard features of a monitor such as adjustable overdrive and image settings, arranged in a well organized on-screen display. It also has a DisplayPort Out for daisy chaining with a second monitor, allowing a computer to have dual monitors using only one DisplayPort.

Additional Features
What it is: Additional features found on the monitor
Score components:
Speakers
What it is: Whether or not the monitor features standalone speakers.
When it matters: When using your computer without headphones or a dedicated pair of speakers.
:
No
HDR10 : No

The monitor has a DisplayPort Out which can be used to daisy chain with another monitor. This allows one DisplayPort on a computer to send video output for both monitors to the U2515H, then the Dell 2515H sends video to the second monitor, effectively allowing dual monitors using only one DisplayPort.

On-Screen Display (OSD)
Controls
Dell U2515H Controls picture

On the lower right corner of the monitor, there are five capacitive buttons for controlling the OSD and power. These soft touch buttons can take some getting used to as they lack any feedback that they've been pressed. There is an option in the OSD to make the monitor chirp when the buttons are pressed, but this can be annoying.

In The Box
Dell U2515H In The Box picture

  • Manual and drivers
  • Power cable
  • Displayport to Mini Displayport cable
  • USB cable

Differences between Sizes and Variants

We tested the U2515H, which is a 2015 model 25" Ultrasharp monitor. There are many other sizes and year variants of the Dell Ultrasharp monitors, listed below.

If someone comes across a different type of panel or if their Dell U2515H doesn't correspond to our review, let us know and we will update the review. Note that some tests such as the gray uniformity may vary between individual units.

Model Size Year Resolution
U2415 24" 2015 1920x1200
U2515H 25" 2015 2560x1440
U2715H 27" 2015 2560x1440
U2717D 27" 2017 2560x1440
U2518D 25" 2018 2560x1440

Compared to other Monitors

Dell U2515H Group Shot Picture
Left: Dell P2417H. Middle: Dell U2515H. Right: LG 27UD58-B.
Unlike our other photographs, this picture wasn't taken under a controlled environment, so do not draw conclusions from it.

The Dell U2515H is a decent monitor for a wide range of usages due to the decent picture quality, wide viewing angles and good range of ergonomic adjustments. While it does perform decently across the board, for a specific use there may be better competition.

Dell U2518D

The Dell U2518D is better than the Dell U2515H. The Dell U2518D has HDR support, and this gives it an advantage over the Dell U2515H in almost all usages. On the other hand, the Dell U2515H has somewhat better input lag that makes it very responsive and will be appreciated mostly by gamers.

Acer G257HU

The Dell U2515H is much better than the Acer G257HU. The design of the U2515H is far superior, with far more ergonomic adjustments as well as VESA mounting ports. The U2515H has much better gradient handling with less banding, and is free of distracting temporary image retention. The U2515H also has better features, including the ability to daisy chain to another monitor, as well as USB charging ports.

LG 27UK650

The LG 27UK650 is better than the Dell U2715H. The Dell U2715H has better ergonomics that easily allow you to place it comfortably. On the other hand, the LG 27UK650 has slightly better refresh rate, better resolution and size and marginally better vertical viewing angle that make it more suitable for almost every usage. Finally, the LG 27UK650 offers HDR support, albeit not great. 

Dell P2417H

The Dell P2417H and the Dell U2515H offer very similar performance. The U2515H has a better native resolution and is a bit larger, but has worse black uniformity than the P2417H. If you want a larger screen, the U2515H is a better choice.

Acer GN246HL

The Dell U2515H is more suitable for a room with wide seating. On the other hand, the Acer GN246HL is a very fast monitor with very good motion features. The Dell U2515H has better viewing angles and significantly better ergonomics so you can position it to your likings. Also, it has better resolution and marginally larger size, giving you more detail to work on. The Dell U2515H also has slightly better input lag which is great for gaming.

Dell U2715H

The U2715H is the larger 27" model in Dell's UltraSharp range of monitors. It is almost the same monitor but bigger, with the same 1440p resolution and wide viewing angles. Both monitors offer sub-par performance in a dark room due to blacks that appear gray and blotchy. Overall, between these two monitors, it is just a question of size so go with whichever suits your budget and preferences. 

LG 27UD58-B

The LG 27UD58-B is a similarly priced 27" monitor with a 4k resolution. Although it has the same 60Hz refresh rate, it does have FreeSync, which is good for gamers to reduce screen tearing. It has similar picture quality, with an IPS panel, but can't get as bright to combat glare and the lack of ergonomic adjustments make it difficult to find a comfortable viewing position. The 4k resolution is good for multi-tasking, but if very high density isn't important to you, then the Dell is a better overall choice.

BenQ Zowie XL2540

The BenQ Zowie XL2540 is a gaming oriented monitor with a lower 1080p resolution but much higher 240Hz refresh rate. The picture quality is sub-par due to the TN panel, and the image also loses accuracy when viewed at an angle. For gamers though, the monitor feels incredibly responsive when at 240fps due to the low input lag and lack of motion blur. If you only want to game at high FPS then the Zowie XL2540 is a great choice, but if you care about picture quality or plan to watch other content or browse the web then the Dell is a better option.

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Conclusion
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7.3Mixed Usage
Score components:
  • 30% Office
  • 30% Multimedia
  • 25% Gaming
  • 10% Media Creation
  • 5% HDR Gaming
The Dell U2515H is a decent monitor for a mixed usage. It has okay picture quality and the image remains accurate when viewed at an angle, which is good. The 1440p resolution is also a good fit for editing content or even browsing the web. Its well-rounded set of features doesn't make any aspect particularly stand out, but it makes it well fit for those looking for a monitor that works well in a varied set of usages.
Good monitor for use in an office. The Dell U2515H's stand offers a wide range of flexibility for easy adjustment on a desk or easy rotation to share with coworkers. Its decently high resolution also gives a large virtual workspace which is helpful for more productive tasks. The picture quality is also decent, and the monitor remains accurate when viewed at an angle which is good.
Good Gaming monitor. The Dell Ultrasharp U2515H covers the gaming essentials without issues; its input lag is low, and it doesn't produce a large amount of motion blur. The picture quality is also decent, and the screen can get bright enough to overcome glare. However, it is limited by the 60Hz refresh rate, and lack of more advanced features such as FreeSync.
Decent monitor for consuming a variety of media. The Dell's high resolution produces pleasingly sharp images and videos, and it reproduces colors well. Unfortunately, its overall picture quality is only ordinary, and it lacks any form of HDR support or local dimming.
Decent monitor for creating media. The Dell Ultrasharp U2515H comes quite accurate out of the factory, reducing the need for calibration which is useful for smaller scale media creators. Its wide viewing angle helps keep the content shown on-screen accurate within a fairly large range of viewing positions as well. However, it does lack support for more modern wide color gamuts commonly used today.
Doesn't support HDR or HDR features such as a wide color gamut. There are only a few monitors which support HDR and have a wide color gamut such as the Samsung CHG70.

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