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LG 27GN950-B Monitor Review

Tested using Methodology v1.1
Reviewed Nov 19, 2020 at 08:12 am
LG 27GN950-B Picture
8.0
Mixed Usage
8.0
Office
8.3
Gaming
7.8
Multimedia
8.0
Media Creation
7.1
HDR Gaming
Size 27"
Resolution 3840x2160
Max Refresh Rate
144 Hz
Pixel Type
IPS
Variable Refresh Rate
FreeSync

The LG 27GN950-B is a great 4k gaming monitor. It has a high 144Hz refresh rate, but you can only achieve that refresh rate over a DisplayPort connection and you need a high-end graphics card to take full advantage of this monitor. It lacks HDMI 2.1 support and can only achieve 4k @ 60Hz over an HDMI connection. It delivers impressive gaming performance thanks to its incredible response time that results in extremely clear motion, and it also has an incredibly low input lag. It has FreeSync variable refresh rate (VRR) support and G-SYNC compatibility to reduce screen tearing. It's fairly well-built, but it doesn't offer much in terms of ergonomics as you can't swivel it. Its IPS panel provides wide viewing angles, but sadly, that comes at the cost of a low contrast ratio. It also has disappointing reflection handling, but it gets bright enough to combat glare in most well-lit rooms.

Our Verdict

8.0 Mixed Usage

The LG 27GN950-B is a great monitor for most uses. It's impressive for gaming because it has an incredible response time, FreeSync support, G-SYNC compatibility, and low input lag. Its 4k resolution makes it a great choice for office use or content creators, but it has disappointing ergonomics. It has decent HDR performance, but its low contrast and terrible local dimming feature make it less ideal for dark-room viewing.

Pros
  • High 4k resolution.
  • FreeSync support and G-SYNC compatibility.
  • Incredible response time.
  • Wide viewing angles.
Cons
  • Disappointing reflection handling.
  • Low contrast ratio.
  • Terrible local dimming feature.
8.0 Office

The LG 27GN950-B is great for office use. The 4k resolution delivers clear and crisp text, and the large screen allows you to open multiple windows at once. It has wide viewing angles, making it easier to share your screen with others. Sadly, it has disappointing ergonomics and may be difficult to place in an ideal viewing position.

Pros
  • High 4k resolution.
  • Gets bright enough to combat glare.
  • Wide viewing angles.
Cons
  • Limited ergonomics.
  • Disappointing reflection handling.
8.3 Gaming

The LG 27GN950-B is impressive for gaming. It has a high 144Hz refresh rate and VRR support to reduce screen tearing. It has an incredible response time and low input lag whether you're gaming at its max refresh rate or 60Hz. Sadly, it's not a good choice for dark-room gaming due to its low contrast ratio and terrible black uniformity.

Pros
  • Extremely low input lag.
  • FreeSync support and G-SYNC compatibility.
  • Incredible response time.
Cons
  • Low contrast ratio.
7.8 Multimedia

The LG 27GN950-B is good for multimedia use. The 4k resolution allows you to watch the latest videos online with crisp detail. You can share your screen with others thanks to its wide viewing angles, but it has disappointing ergonomics. It gets bright enough to combat glare in well-lit rooms, but it has disappointing reflection handling.

Pros
  • High 4k resolution.
  • Wide viewing angles.
Cons
  • Limited ergonomics.
  • Disappointing reflection handling.
8.0 Media Creation

The LG 27GN950-B is great for content creators. You can easily see crisp details of your photos or videos with its 4k resolution, and the large screen allows you to open multiple windows at once. It also has excellent coverage of the Adobe RGB color space used in photo editing. Sadly, it has disappointing ergonomics and you can't swivel the screen to share it with a client or coworker.

Pros
  • High 4k resolution.
  • Gets bright enough to combat glare.
  • Wide viewing angles.
Cons
  • Limited ergonomics.
  • Disappointing reflection handling.
7.1 HDR Gaming

The LG 27GN950-B is decent for HDR gaming. It has great gaming features such as an incredible response time, low input lag, and VRR support. It also displays a wide color gamut and gets bright enough in HDR to make some highlights pop. However, it has a low contrast ratio, and its local dimming feature performs terribly, so dark scenes don't look good.

Pros
  • FreeSync support and G-SYNC compatibility.
  • Incredible response time.
  • Displays wide color gamut.
Cons
  • Low contrast ratio.
  • Terrible local dimming feature.
  • Noticeable blooming around bright objects.
  • 8.0 Mixed Usage
  • 8.0 Office
  • 8.3 Gaming
  • 7.8 Multimedia
  • 8.0 Media Creation
  • 7.1 HDR Gaming

Test Results

perceptual testing image
Design
Design
Style
Curved No
Curve Radius Not Curved
Weight (without stand)
12.1 lbs (5.5 kg)
Weight (with stand)
16.8 lbs (7.6 kg)

The LG 27GN950 looks like most other monitors in LG's UltraGear lineup, such as the LG 34GN850-B, except it doesn't have a curved screen. It's mainly black with red accents throughout, and the RGB ring on the back adds to its gamer-oriented design. It's fairly well-built, and its stand offers cable management, but it has disappointing ergonomics.

Design
Stand
Width
16.7" (42.5 cm)
Depth
11.5" (29.2 cm)

There's a wide V-shaped stand that holds the monitor well, and there's enough room to place stuff in front.

5.9
Design
Ergonomics
Height Adjustment
4.3" (11.0 cm)
Switch Portrait/Landscape Yes, Clockwise
Swivel Range No swivel
Tilt Range -15° to 5°

The LG 27GN950 has disappointing ergonomics. It doesn't offer any swivel range, but you can rotate it into portrait mode. You can also rotate it an extra 5 degrees counterclockwise when in landscape mode, and 2 degrees clockwise when in portrait mode, allowing for more precise placement of the screen.

Design
Back
Wall Mount VESA 100x100

The back of the LG 27GN950 has a gamer-oriented look with red accents. There's an RGB ring near the vents, and there's cable management through the hook in the stand. There's also a quick-release button for when you need to remove the screen from the stand.

Design
Borders
Borders
0.2" (0.6 cm)

The LG 27GN950 has very thin borders, great for a multi-monitor setup.

Design
Thickness
Thickness (with stand)
9.1" (23.0 cm)
Thickness (without stand)
2.4" (6.0 cm)

The screen is somewhat thick on its own, and the whole setup takes up a good amount of space with the stand attached.

7.0
Design
Build Quality

The LG 27GN950 has a decent build quality, similar to most of LG's UltraGear models. It's entirely made out of plastic, but there aren't any obvious issues to its build.

Picture Quality
6.1
Picture Quality
Contrast
Native Contrast
1048 : 1
Contrast With Local Dimming
1051 : 1

The LG 27GN950 has a mediocre contrast ratio and blacks appear gray when viewed in the dark, which is typical of IPS monitors. It's slightly higher than the advertised 1000:1 contrast, but this may vary between units. Sadly, the local dimming feature doesn't really improve the contrast by much, if at all.

2.0
Picture Quality
Local Dimming
Local Dimming
Yes
Backlight
Edge

Like most monitors, the LG 27GN950 has an edge-lit local dimming feature and it performs terribly. There are a limited number of dimming zones, so even though transitions between zones are quick, it's quite noticeable. Most of the zones turn on when there's a bright object in a dark scene, and it results in blooming and bad uniformity. The local dimming feature raises the black level and doesn't improve picture quality in dark scenes. It's more aggressive in HDR than SDR with our test pattern, but it doesn't seem to do much in real scenes unless it's a dark scene, at which point its bad uniformity and blooming become distracting.

8.3
Picture Quality
SDR Peak Brightness
SDR Real Scene
423 cd/m²
SDR Peak 2% Window
423 cd/m²
SDR Peak 10% Window
424 cd/m²
SDR Peak 25% Window
424 cd/m²
SDR Peak 50% Window
424 cd/m²
SDR Peak 100% Window
424 cd/m²
SDR Sustained 2% Window
422 cd/m²
SDR Sustained 10% Window
424 cd/m²
SDR Sustained 25% Window
424 cd/m²
SDR Sustained 50% Window
424 cd/m²
SDR Sustained 100% Window
424 cd/m²
SDR ABL
0.000

The LG 27GN950 has impressive SDR peak brightness. It easily gets bright enough to combat glare and it's very consistent across varied content. We measured peak brightness after calibration in the 'Gamer 1' Picture Mode with Color set to 'Custom.'

7.4
Picture Quality
HDR Peak Brightness
HDR Real Scene
454 cd/m²
HDR Peak 2% Window
678 cd/m²
HDR Peak 10% Window
710 cd/m²
HDR Peak 25% Window
722 cd/m²
HDR Peak 50% Window
729 cd/m²
HDR Peak 100% Window
730 cd/m²
HDR Sustained 2% Window
677 cd/m²
HDR Sustained 10% Window
708 cd/m²
HDR Sustained 25% Window
441 cd/m²
HDR Sustained 50% Window
444 cd/m²
HDR Sustained 100% Window
445 cd/m²
HDR ABL
0.035

The HDR peak brightness is decent. It gets bright enough to make small highlights pop and it meets its DisplayHDR 600 certification. However, it quickly loses brightness the longer an image stays on the screen, as seen in the difference between the Peak and Sustained windows. Also, it's not as consistent between different content as it is with SDR content, but this shouldn't be noticeable for most people.

7.7
Picture Quality
Horizontal Viewing Angle
Color Washout From Left
37 °
Color Washout From Right
36 °
Color Shift From Left
53 °
Color Shift From Right
55 °
Brightness Loss From Left
42 °
Brightness Loss From Right
42 °
Black Level Raise From Left
70 °
Black Level Raise From Right
70 °
Gamma Shift From Left
39 °
Gamma Shift From Right
40 °

The LG 27GN950 has a good wide horizontal viewing angle, which is expected from an IPS panel. The image remains accurate when viewing from the side, which is great for sharing your screen with others.

8.2
Picture Quality
Vertical Viewing Angle
Color Washout From Below
38 °
Color Washout From Above
34 °
Color Shift From Below
67 °
Color Shift From Above
68 °
Brightness Loss From Below
39 °
Brightness Loss From Above
37 °
Black Level Raise From Below
70 °
Black Level Raise From Above
70 °
Gamma Shift From Below
52 °
Gamma Shift From Above
60 °

The vertical viewing angle is great, which is once again expected from an IPS panel. The image remains accurate if you mount it above eye-level.

8.7
Picture Quality
Gray Uniformity
50% Std. Dev.
3.548 %
50% DSE
0.102 %
5% Std. Dev.
0.477 %
5% DSE
0.047 %

The LG 27GN950's gray uniformity is excellent. The edges of the screen are a bit darker, but there's no dirty screen effect in the center. Uniformity is much better in near-dark scenes. Note that gray uniformity may vary between units.

2.3
Picture Quality
Black Uniformity
Native Std. Dev.
4.222 %
Std. Dev. w/ L.D.
5.843 %

The LG 27GN950 has terrible black uniformity, but this may vary between units. There's severe backlight bleed in the corners, clouding throughout, and the entire screen looks blueish/gray. The uniformity is actually worse with local dimming enabled as the edges are visibly darker.

8.5
Picture Quality
Pre Calibration
Picture Mode
sRGB
Luminance
102 cd/m²
Luminance Settings
5
Contrast Setting
70
RGB Controls
50-50-50
Gamma Setting
No Gamma Setting
Color Temperature
6429 K
White Balance dE
1.19
Color dE
2.70
Gamma
2.29

The out-of-the-box accuracy is excellent, but this may vary between units. There are only slight inaccuracies with most colors and shades of gray that most people shouldn't notice, except some yellows and greens are more inaccurate. The color temperature is only slightly warmer than our 6500K target. However, gamma doesn't follow the sRGB target curve all that well and most scenes are darker than they should be.

9.7
Picture Quality
Post Calibration
Picture Mode
Gamer 1
Luminance
99 cd/m²
Luminance Settings
4
Contrast Setting
70
RGB Controls
50-50-48
Gamma Setting
Mode 2
Color Temperature
6529 K
White Balance dE
0.58
Color dE
0.33
Gamma
2.19

The LG 27GN950's accuracy after calibration is incredible. Any remaining inaccuracies can't be spotted by the naked eye and gamma follows the target curve a lot better. The color temperature is slightly cooler from before calibration, but it's closer to the target.

You can download our ICC profile calibration here. This is provided for reference only and shouldn't be used, as the calibration values vary per individual unit even for the same model due to manufacturing tolerances.

9.4
Picture Quality
SDR Color Gamut
sRGB xy
100.0 %
Adobe RGB xy
88.3 %
sRGB Picture Mode
Gamer 1
Adobe RGB Picture Mode
Gamer 1

The SDR color gamut is incredible. It has perfect coverage of the sRGB color space used in most web content and excellent coverage of the Adobe RGB color space used in photo editing.

9.5
Picture Quality
SDR Color Volume
sRGB In ICtCp
97.5 %
Adobe RGB In ICtCp
91.8 %
sRGB Picture Mode
Gamer 1
Adobe RGB Picture Mode
Gamer 1

The LG 27GN950 has exceptional color volume. It displays bright colors well thanks to its high peak brightness, but it struggles with dark colors due to the low contrast ratio.

7.7
Picture Quality
HDR Color Gamut
Wide Color Gamut
Yes
DCI P3 xy
84.2 %
Rec. 2020 xy
69.4 %
DCI P3 Picture Mode
Gamer 1
Rec. 2020 Picture Mode
Gamer 1

The LG 27GN950 has a good HDR color gamut. It's considered a wide color gamut and has impressive coverage of the DCI P3 color space used in most HDR content. However, its coverage of the wider Rec. 2020 color space is more limiting.

Note: The DCI P3 coverage is much lower than the advertised 98% coverage. This is normal and is due to the way we measure DCI P3. We measure DCI P3 by sending a Rec. 2020 signal, but unlike most reviewers, we limit the colors we're sending to the DCI P3 primaries. This results in a lower, but arguably more accurate measurement.

7.1
Picture Quality
HDR Color Volume
DCI-P3 In ICtCp
78.9 %
Rec. 2020 In ICtCp
63.2 %
DCI P3 Picture Mode
Gamer 1
Rec. 2020 Picture Mode
Gamer 1

The HDR color volume is decent. Its wide color gamut helps it display a range of colors at different luminance levels, but it can't display dark, saturated colors well.

10
Picture Quality
Image Retention
IR After 0 Min Recovery
0.00 %
IR After 2 Min Recovery
0.00 %
IR After 4 Min Recovery
0.00 %
IR After 6 Min Recovery
0.00 %
IR After 8 Min Recovery
0.00 %
IR After 10 Min Recovery
0.00 %

There are no signs of temporary image retention, but this may vary between units.

9.8
Picture Quality
Gradient
Color Depth
10 Bit

The LG 27GN950-B has fantastic gradient handling. There are almost no visible signs of banding within shades.

Note: We ran this test with a 1080p resolution instead of 4k. Our software kept crashing with a 10-bit, 4k resolution, so we had to lower the resolution to 1080p, but it didn't affect the gradient handling score.

10
Picture Quality
Color Bleed
Pixel Row Error
0.000 %
Pixel Column Error
0.002 %

There are no signs of color bleed on the LG 27GN950.

5.7
Picture Quality
Reflections
Screen Finish
Semi-Gloss
Total Reflections
8.9 %
Indirect Reflections
4.9 %
Calculated Direct Reflections
4.0 %

The LG 27GN950 has disappointing gradient handling, and it's much worse than the lower-end LG 27GN750-B. The reflections may become too distracting even in moderately-lit rooms, but thankfully, it gets bright enough to combat glare.

9.0
Picture Quality
Text Clarity
Sub-Pixel Layout
RGB

Thanks to the high 4k resolution, the LG 27GN950-B has outstanding text clarity. Enabling ClearType (top photo) makes text even easier to read.

Motion
9.5
Motion
Response Time @ Max Refresh Rate
Best Overdrive Setting
Fast
Rise / Fall Time
3.5 ms
Total Response Time
6.9 ms
Overshoot Error
3.0 %
Dark Rise / Fall Time
3.7 ms
Dark Total Response Time
7.1 ms
Dark Overshoot Error
3.5 %

Overdrive Setting Response Time Chart Response Time Tables Motion Blur Photo
Off Chart Table Photo
Normal Chart Table Photo
Fast Chart Table Photo
Faster Chart Table Photo

The LG 27UN950-B has an incredible response time at its max refresh rate of 144Hz. Motion looks exceptionally clear and there's hardly any blur with fast-moving objects. We recommend using the 'Fast' overdrive setting as it has a lot less overshoot than the 'Faster' setting. There's still some overshoot in lighter transitions, and if that bothers you, setting it to 'Normal' results in a slightly slower response time, but no overshoot.

9.4
Motion
Response Time @ 60Hz
Best Overdrive Setting
Normal
Rise / Fall Time
4.1 ms
Total Response Time
8.3 ms
Overshoot Error
0.4 %
Dark Rise / Fall Time
4.5 ms
Dark Total Response Time
10.5 ms
Dark Overshoot Error
1.3 %

Overdrive Setting Response Time Chart Response Time Tables Motion Blur Photo
Off Chart Table Photo
Normal Chart Table Photo
Fast Chart Table Photo
Faster Chart Table Photo

The LG 27GN950-B has a remarkable response time at 60Hz, and once again, motions looks extremely clear. Unlike at its max refresh rate, we recommend using the 'Normal' overdrive setting as there's too much overshoot in the 'Fast' and 'Faster' settings, so you may have to change the setting if the frame rate of your game drops.

10
Motion
Image Flicker
Flicker-Free Yes
PWM Dimming Frequency
0 Hz

The LG 27GN950 has a flicker-free backlight, which helps reduce eye strain.

0
Motion
Black Frame Insertion (BFI)
Black Frame Insertion (BFI)
No BFI
BFI Maximum Frequency
N/A
BFI Minimum Frequency
N/A

Unfortunately, there's no optional Black Frame Insertion feature.

9.0
Motion
Refresh Rate
Native
144 Hz
Max Refresh Rate
144 Hz
Variable Refresh Rate
Yes
FreeSync
Yes
G-SYNC
Compatible (NVIDIA Certified)
VRR Maximum
144 Hz
VRR Minimum
< 20 Hz
VRR Supported Connectors DisplayPort, HDMI

The LG 27UN950-B has native FreeSync Premium Pro support to reduce screen tearing, and it's certified by NVIDIA to be G-SYNC compatible as well. You need a DisplayPort connection to achieve its max 144Hz refresh rate and G-SYNC support. Its FreeSync VRR range over a DP connection is between 50-95Hz. Over HDMI, you can achieve a max refresh rate of 60Hz and it only supports FreeSync.

Inputs
9.5
Inputs
Input Lag
Native Resolution
4.1 ms
Native Resolution @ 60Hz
9.2 ms
Variable Refresh Rate
5.3 ms
Variable Refresh Rate @ 60Hz
11.4 ms
10 Bit HDR
9.4 ms
Black Frame Insertion (BFI)
N/A

The LG 27GN950-B has an incredibly low input lag. It slightly increases with VRR enabled, but it shouldn't be noticeable at all.

9.2