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Reviewed on Jul 27, 2018 , Eric Bousquet, Ian Cumming, Bruno St-Georges-Robert, Dimitris Katsaounis, Yannick Khong

Samsung CF791
MONITOR REVIEW

Usage Ratings - Version 1.0

Test Benches: test

  • 1.0: Fall 2017
6.9
Mixed Usage
Score components:
  • 30% Office
  • 30% Multimedia
  • 25% Gaming
  • 10% Media Creation
  • 5% HDR Gaming
Size : 34 "
Resolution : 3440x1440
Refresh Rate : 100 Hz
LCD Type
What it is: Type of LCD technology used by the monitor.
When it matters: Different technologies have different viewing angle properties.
:
VA
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.
:
FreeSync

The Samsung CF791 is a decent ultrawide monitor. It has a VA panel which can produce deep dark scenes which is good for those in a dark room. It also has great gray uniformity, which is good for watching videos or browsing the web. Unfortunately, the image degrades when viewed at an angle, but the curvature of the display helps to mitigate this. The C34F791 also has great motion handling with a fast 100Hz refresh rate.

Test Results
Design 8.0
Picture Quality 6.2
Motion 8.7
Inputs 7.9
Pros
  • Can produce deep dark scenes
  • Colors appear uniform
  • Great motion handling
Cons
  • Image degrades when viewed at an angle
  • Higher input lag than other monitors

Check Price

8.0

Design

Score components: Subjectively assigned
Samsung CF791 Design Picture
Curved : Yes
Curve radius : 1500R
Weight (without stand) : 13.2lbs (6.0 kg)
Weight (with stand) : 16.5lbs (7.5 kg)

The design of the Samsung CF791 is very good. The stand supports it well and the monitor feels sturdy. Due to the stand design, the monitor looks thick when viewed from the side. In general, it has an elegant look and nice cable management that adds to its premium feel. The build quality is good and you should have no problems with it. 

Stand
Samsung CF791 Stand picture
Width : 9.7" (24.7 cm)
Depth : 12.2" (31.0 cm)

The Samsung C34F791 has a round stand that supports the monitor well.

4.7 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
Samsung CF791 Ergonomics picture
Height Adjustment : 3.9" (10.0 cm)
Switch portrait/landscape : No
Swivel Range : N/A
Tilt Range : -20° to 15°

The tilt range varies along the height adjustment positions:
@ top: 15° to -20°
@ bottom: 2.5° to -30°

The ergonomics of the monitor are inadequate. For a large monitor like this, the provided positioning options are not enough to allow you to place it in a comfortable position.

Back
Samsung CF791 Back picture
Wall Mount : VESA 100x100

The back of the monitor is plain. Most of the inputs are housed in a compartment (that comes with a cover) and are pointing downwards so as not to protrude, except the USB ports and the headphones jack.

It is nice that both 100x100 & 200x200 (using the included adapter) VESA wall mounts options are available.

The cable management through the stand is very nice and makes the monitor look clean on the back.

Borders
Samsung CF791 Borders picture
Borders : 0.3" (0.7 cm)

The borders are thin and elegant. This is good for those who want to use multiple monitors as they can be placed together without much gap.

Thickness
Samsung CF791 Thickness picture
Thickness (with stand) : 8.1" (20.5 cm)
Thickness (without stand) : 4.6" (11.8 cm)

The monitor is quite thick. This is mainly due to its stand and less due to the curvature of the screen, which does mean it has to sit back quite far from a wall. If you VESA mount it, it will not protrude too much given its size.

8.0 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
Samsung CF791 Build Quality picture

The build quality of the Samsung CF791 is great. There are no gaps or loose ends and you should have no issues.

The picture quality of the Samsung CF781 is decent. It has a good contrast ratio and great gray uniformity, good color accuracy, and no color bleed. Reflection handling is good but the monitor cannot get very bright to be suitable for very bright rooms. It has poor viewing angles, typical of VA panels, and some banding is visible in the darker shades. 

7.6 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:
Samsung CF791 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
:
2527 : 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 Samsung CF791 has very good contrast. When placed in a dark room, blacks look deep and this helps the picture quality.

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.
:
Direct

The Samsung C34F791 does not have a local dimming feature. The video is for reference only.

7.0 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.
:
264 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
:
247 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
:
246 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.
:
246 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.
:
245 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.
:
244 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.
:
246 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.
:
246 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.
:
245 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.
:
245 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.
:
244 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
:
0.001

Decent SDR peak brightness for this monitor. It keeps the same level of brightness across the various bright window sizes and this is great. This is fine for most rooms, but may not be bright enough to overcome glare in a bright room.

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.

4.9 Horizontal Viewing Angle
What it is: Color accuracy when viewed from the side.
Samsung CF791 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°
:
33 °
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°
:
32 °
Samsung CF791 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°
:
45 °
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 °
Samsung CF791 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°
:
12 °
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°
:
11 °
Curve Radius : 1500 R

The horizontal viewing angles are poor. Blacks wash out as soon as you deviate from the center axis and a few degrees later, colors shift and brightness fades. This is mitigated a bit by the curvature of the display, which means that the sides of the screen face towards a central seating position.

4.4 Vertical Viewing Angle
What it is: Color accuracy when viewed from the top or bottom.
Samsung CF791 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°
:
26 °
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°
:
26 °
Samsung CF791 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°
:
33 °
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°
:
33 °
Samsung CF791 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°
:
5 °
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°
:
5 °

The vertical viewing angles are bad. In this case, too, blacks are the first ones to lose accuracy, almost immediately off the center axis. And then followed by a shift in colors and loss of brightness as the viewing angle increases.

8.3 Gray Uniformity
What it is: Evenness of colors onscreen (not just gray).
When it matters: Solid colors. Sports, panning shots.
Score components:
Samsung CF791 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%
:
4.408 %
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%
:
0.103 %
Samsung CF791 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%
:
1.8 %
5% DSE
What it is: High-frequency variance of uniformity. Dark spots on the screen.
When it matters: Dark scenes.
Good value: < 0.116%
:
0.061 %

The gray uniformity of the Samsung CF791 is very good. Very little clouding is visible on our test image and almost no dirty screen effect can be observed when surfing the web.

5.2 Black Uniformity
What it is: Evenness of blacks.
When it matters: Dark scenes viewed in a dark room.
Score components:
Samsung CF791 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.
:
2.554 %
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 black uniformity is disappointing. There is some clouding in the picture in the very dark scenes that some will pick up when seated in a dark room.

7.2 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:
Samsung CF791 Pre Calibration Picture Samsung CF791 Pre Gamma Curve Picture Samsung CF791 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.
:
Custom
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.
:
242 cd/m²
Luminance Settings
What it is: The luminance settings, often named 'Brightness' on monitors, usually range from 0 to 100.
:
100
Contrast Setting
What it is: The monitor contrast setting, usually ranging from 0 to 100.
:
75
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.
:
Cool1
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
:
6346 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
:
3.46
Color dE
What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
3.09
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
:
2.26

The out-of-the-box color accuracy of the Samsung C34F791 is good. The Custom picture mode gave us the best out of the box results. Both the white balance dE and the color dE were above our target of 3, thus some people will pick up gray and color inaccuracies. Color temperature was slightly warm giving the picture a very slight red-yellowish tone. Gamma was slightly above our 2.2 target and shades look slightly brighter.

9.5 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:
Samsung CF791 Post Calibration Picture Samsung CF791 Post Gamma Curve Picture Samsung CF791 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
Luminance
What it is: The luminance at which the calibration was executed. We aim for a luminance level of 100 cd/m².
:
99 cd/m²
Luminance Settings
What it is: The luminance settings, often named 'Brightness' on monitors, usually range from 0 to 100.
:
23
Contrast Setting
What it is: The monitor contrast setting, usually ranging from 0 to 100.
:
75
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.
:
35-44-50
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
:
6432 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
:
0.63
Color dE
What it is: Average inaccuracy of colors.
When it matters: All colors.
Good value: < 3
Noticeable difference: 1
:
0.84
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

The color accuracy after post calibration is excellent. White balance dE and Color dE are well below the threshold of 3, and it is highly unlikely that you will notice any inaccuracies. At the same time, Gamma was measured almost on the target of 2.2 and color temperature remained just slightly warmer than our target, but this is not noticeable.

You can download our ICC profile calibration here.

8.8 SDR Color Gamut
What it is: The palette of colors the monitor can display
When it matters: General content consumption or production
Score components:
Samsung CF791 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%
:
95.6 %
Samsung CF791 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%
:
80.8 %

s.RGB Picture Mode: Custom (calibrated)
Adobe RGB Picture Mode: Custom

Excellent coverage of the s.RGB colorspace for the Samsung CF791. On the other hand the coverage of the wider Adobe s.RGB colorspace used by professionals in graphics and printing applications is about 80% covered, which isn't really enough for those editing photos in the Adobe RGB color space.

9.3 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:
Samsung CF791 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
:
98.5 %
Samsung CF791 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
:
88.2 %

s.RGB Picture Mode: Custom
Adobe RGB Picture Mode: Custom

Excellent results in our color volume test. The monitor is able to display a wide range of SDR colors across its full range of brightness levels.

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

HDR is not supported.

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

HDR is not supported.

7.7 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.
Samsung CF791 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%
:
0.11 %
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 Samsung C34F791 has a good image retention performance. However, some slight signs of image retention are present immediately after the exposure of our test image. This is unlikely to be noticeable in most content.

7.3 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
Samsung CF791 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 Samsung CF791 has decent gradient performance. 8-bit banding is present along with some artifacts, especially in dark color shades. This, however, should not be an issue for most usages.

10.0 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:
Samsung CF791 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%
:
0.001 %
Samsung CF791 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%
:
0.001 %

Perfect color bleed performance as nearby colors are not affected by large uniform shades and this is good for accuracy.

7.5 Reflections
What it is: How much light is reflected by the TV.
When it matters: Bright rooms.
Score components: Subjectively assigned
Samsung CF791 Average room Samsung CF791 Average room off picture Samsung CF791 Bright room off picture

The Samsung CF791 has good reflection handling. The matte finish reduces the reflection intensity by diffusing them on the screen. For most situations this is ok, but in a bright room, reflections might become distracting.

8.7

Motion

Score components:

The Samsung CF791 has excellent motion handling. It has a very fast response time and the backlight does not flicker when it dims. It supports the FreeSync implementation of the variable refresh rate (VRR) technology to smooth out gameplay on graphics intensive games.

8.9 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:
Samsung CF791 Motion Blur Picture Samsung CF791 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
:
4.0 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
:
13.7 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.
:
Faster

Response Time Standard
Response Time Faster
Response Time Fastest

The Samsung CF791 has an excellent response time. Setting the Response Time overdrive option to Faster provides the shortest response time. The Fastest settings has a better 80% response time, but it adds some considerable overshoot so we recommend the Faster setting.

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
Samsung CF791 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 Samsung CF791 dims the backlight without using any PWM flickering. This helps motion be smooth and creates blur. On the other hand, there isn't any black frame insertion option available to add flicker in order to remove blur and make the image look crispier.

8.8 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
:
100 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.
:
FreeSync
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
:
100 Hz
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
:
< 20 Hz
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 : DisplayPort, HDMI

The Samsung CF791 has a remarkable refresh rate of 100 Hz, which is better than the common 60 Hz most monitors have but not as good as the 144 Hz of high-end gaming monitors. It also supports FreeSync so as to adjust the screen's refresh rate to the frame rate of a compatible graphics card and prevent tearing.

The monitor's FreeSync Ultimate Engine setting has a range of 100-48 Hz, which is wide enough for FreeSync's Low Framerate Compensation (LFC) feature to extend its effective range to below 20 Hz. Unfortunately the FreeSync Standard Engine setting only has a narrow 100-80 Hz range.

Unfortunately this monitor's FreeSync implementation has some bugs with how it interacts with some GPUs and graphics drivers. On our Radeon RX 580 test PC it was impossible to make FreeSync work properly over DisplayPort, even though it worked fine over HDMI, and worked fine over DisplayPort on our PC with an AMD Ryzen 3 2200G APU. Also the number of support forum threads about CF791 FreeSync issues is greater than for most monitors of similar popularity, with numerous reports of problems with certain Radeon driver versions and other issues.

7.9

Inputs

Score components:

The input lag of this monitor is okay, although most recent monitors have lower input lag. On the other hand, this is a 34",  21:9 monitor with great resolution that will give you plenty of space and enough detail to work without issues.

7.2 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
:
20.7 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
:
N/A
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
:
26.9 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
:
23.6 ms
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

Variable Refresh Rate tested over HDMI, all others tested over DisplayPort.

The input lag is worse than most monitors.

No non-native resolution is able to run at 100 Hz without using a custom resolution, though nearly all can run at 60 Hz. This isn't usually an issue though because most graphics cards upscale non-native resolutions by default.

The Game mode did not reduce input lag significantly as it was only 0.1 ms shorter with this setting enabled, so we recommend leaving the Game mode disabled for the better picture quality.

The Variable Refresh Rate (VRR) input lag was measured using the HDMI port, because our test PC had trouble with sending FreeSync over DisplayPort with this monitor; see the Refresh Rate box for more detail. We expect the DisplayPort to have the same VRR input lag, because with FreeSync disabled the input lag was the same (20.7 ms via DP, 21.7 ms via HDMI).

8.8 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 : UWQHD, 3440 x 1440
Aspect Ratio : 21:9
Megapixels : 5.0 MP
Pixel Density : 110 PPI
Screen Diagonal : 34.0 inches
Screen Area : 411 sq inches

The Samsung C34F791 is a large 34-inch wide aspect ratio monitor. It has a great resolution that provides you with enough detail to do your work or gameplay.

Inputs
Samsung CF791 Inputs 1 Samsung CF791 Inputs 2

All the monitor's inputs are on the back.

Total Inputs
DisplayPort : 1 (DP 1.2)
Mini DisplayPort : No
HDMI : 2 (HDMI 2.0)
DVI : No
VGA : No
DisplayPort Out : No
USB : 2 (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's full 3440x1440x100Hz native resolution is supported over both DisplayPort and HDMI, which is great.

During testing we encountered some bugs with the monitor's HDMI ports. When changing between the monitor's HDMI 1.4 and HDMI 2.0 modes, sometimes the increased bandwidth of HDMI 2.0 wasn't detected by our PC until after the resolution was changed once. Also sometimes our PC became stuck at 640x480 or 1080p resolution when the HDMI mode was changed, though after a factory reset this issue never recurred.

Features

The Samsung CF791 On-Screen Display (OSD) is easy to navigate due to a small joystick on the back of the monitor. The OSD has all the standard features of a monitor such as color settings and adjustable overdrive, etc. The monitor has internal speakers and this is a helpful feature.  

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.
:
Yes
HDR10 : No

The monitor is equipped with 2 internal speakers but does not support HDR.

Note: During general usage we noticed a bug with one of our PCs: when the PC made the monitor go to sleep it consistently made the PC crash (Blue Screen Of Death, BSOD). We didn't notice this problem on other PCs though.

On-Screen Display (OSD)
Samsung CF791 OSD picture

The on-screen display is easy to navigate using the small joystick on the back of the monitor.

Controls
Samsung CF791 Controls picture

All of the OSD is accessed by using a joystick at the back of the monitor. This can be inconvenient for people who sit farther away from the monitor. The joystick works well and the menus are easy to navigate.

In The Box
Samsung CF791 In The Box picture

  • Manual and drivers
  • Power cable
  • HDMI cable
  • DisplayPort cable
  • USB cable
  • Mini DisplayPort to DisplayPort adapter

Differences between Sizes and Variants

The CF791 we bought is the 34" model (Samsung LC34F791WQNXZA).

Model Alternative Name Size Refresh rate Resolution
CF791 C34F791 34" 100Hz 3440x1440

If someone's CF791 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.

Compared to other Monitors

Samsung CF791 Group Shot Picture
Left: LG 34UC79G-B. Middle: Samsung CF791. Right: Asus PG348Q. 
Unlike our other photographs, this picture wasn't taken under a controlled environment, so do not draw conclusions from it.

The Samsung CF791 is a decent, large screen ultrawide monitor.

Dell U3417W

If you've got a large room with wide seating, then the Dell U3417W is a better choice, but if you are interested in gaming in a dark room while sitting directly in front, then the Samsung CF791 is better. The Dell U3417W has an IPS panel, giving you better viewing angles whereas the CF791 has a slight better refresh rate and a slightly faster response time resulting in clearer motion.

Samsung CHG70

The Samsung CHG70 is much better than the Samsung CF791. The CHG70 has much lower input lag, supports HDR and is equipped with local dimming to make blacks even deeper. You can position it according to your liking and you will enjoy it in every usage. The CF791, on the other hand, is larger, giving you more screen area and more resolution to work with.

LG 34UC79G-B

The LG 34UC79G-B is a better monitor than the Samsung CF791 for almost every usage unless you will be using it in a dark room. The Samsung CF791 has better resolution giving you more details on the screen, but the LG34UC79G has better viewing angles and you will enjoy gaming more as it has significantly better input lag and marginally better image flicker to clear blur.

ASUS ROG PG279Q

The ASUS ROG PG279Q is a much better monitor than the Samsung CF791. If you play a lot of games, the ASUS has significantly better input lag, slightly better motion blur and supports G-Sync to smooth out tearing. Also, the ASUS has better viewing angles, which is great if you wish to use it at the office. 

Acer Predator XB271HU

If you want to work on the same monitor side-by-side with your colleagues at the office, then the Acer Predator XB271HU is a better choice than the Samsung CF791 as it has better viewing angles. The Acer is also better for gaming as it has better input lag, better image flicker to clear blur, and you can easily position it to match your liking. On the other hand, the Samsung CF791 is a larger monitor with higher resolution, giving you more area and more detail to work with.

LG 32GK850G

The LG 32GK850G is better than the Samsung CF791. The LG 32GK850G has a faster pixel response time, and thus the blur trail in fast action content is smaller. The LG 32GK850G has a faster refresh rate and better input lag, and this is great if you play games. The LG 32GK850G also has better ergonomics that make it easy to place comfortably. The Samsung CF791, on the other hand, supports 4k resolution, is 2 inches larger, and has a curve.

Dell D3218HN

The Samsung CF791 is somewhat better than the Dell D3218HN. The Dell has better viewing angles and is more suitable for collaborative work whereas the Samsung is larger and has a much better resolution that allows you to multitask better. The Dell D3218HN has lower input lag if you play casual video games, but the Samsung has faster pixel response time that leaves a shorter motion blur, and faster refresh rate with FreeSync support to eliminate tearing.

+ Show more

Conclusion
SEE PRICE
Amazon.com

6.9Mixed Usage
Score components:
  • 30% Office
  • 30% Multimedia
  • 25% Gaming
  • 10% Media Creation
  • 5% HDR Gaming
This is a decent monitor for mixed usage. It has a mediocre picture quality that can display nice dark scenes but the image degrades at an angle. It has great motion handling and excellent color accuracy for professionals.
This is a decent monitor for office use. Its large screen and excellent resolution give you enough room and detail to work. Unfortunately, the image degrades at an angle and the poor ergonomics will not allow you to easily work side-by-side with a colleague.
The Samsung C34F791 is a good monitor for gaming. It has an ok input lag, fast response time for a smooth image, and the FreeSync implementation of the variable refresh rate technology to prevent tearing. The large size and the excellent resolution of the monitor, give you more screen area and more detail to immerse yourself in your favorite game.
It is an ordinary monitor for multimedia usage. Its large size and excellent resolution, along with its good reflection handling are its main advantages. On the other hand, the poor viewing angles and the bad ergonomics make it difficult to position it in a comfortable position to enjoy the best picture quality.
The Samsung C34F791 is decent monitor for media creation. Due to its size and resolution professionals will find it very comfortable for working. However, the coverage of the Adobe RBG color space might not be enough for those who will be using it for publishing or printing applications.
Unfortunately, the Samsung CF791 does not support HDR like the Samsung CHG70.

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