The LG 27GN950-B is a great 4k gaming monitor. It has a high 160Hz 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.
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.
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.
The LG 27GN950-B is impressive for gaming. It has a high 160Hz 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.
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.
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.
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.
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.
There's a wide V-shaped stand that holds the monitor well, and there's enough room to place stuff in front.
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.
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.
The LG 27GN950 has very thin borders, great for a multi-monitor setup.
The screen is somewhat thick on its own, and the whole setup takes up a good amount of space with the stand attached.
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. If you want a similar monitor with a sturdier build, check out the Dell Alienware AW2721D.
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.
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.
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.'
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.
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.
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.
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.
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.
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.
Update 01/15/2021: We uploaded the post-calibration white balance and color space pictures in the wrong order. It has been fixed.
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.
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.
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.
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.
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.
There are no signs of temporary image retention, but this may vary between units.
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.
There are no signs of color bleed on the LG 27GN950.
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. If you want a similar monitor with better reflection handling, check out the ASUS ROG Strix XG27UQ.
Thanks to the high 4k resolution, the LG 27GN950-B has outstanding text clarity. Enabling ClearType (top photo) makes text even easier to read.
|Overdrive Setting||Response Time Chart||Response Time Tables||Motion Blur Photo|
Update 02/26/2021: We retested the response time at max refresh rate with the latest firmware. The score has changed slightly, from 9.5 to 9.6.
The LG 27UN950-B has an incredible response time at its max refresh rate of 160Hz. 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.
|Overdrive Setting||Response Time Chart||Response Time Tables||Motion Blur 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.
The LG 27GN950 has a flicker-free backlight, which helps reduce eye strain.
Unfortunately, there's no optional Black Frame Insertion feature.
Update 02/26/2021: We retested the refresh rate with the latest firmware. There's now an overclock option in the OSD settings that allows the refresh rate to go up to 160Hz. Enabling it locks Adaptive Sync to 'On'. 160Hz is only achievable at 4k; 1080p and 1440p are still locked at 144Hz, even with overclocking enabled.
Unfortunately, setting the refresh rate to 160Hz impacts VRR performance. Enabling G-SYNC in the NVIDIA Control Panel at 160Hz causes a black screen, and you need to force quit the application or game to get the image back. Additionally, there seems to be some form of V-SYNC active after getting the image back, so even if G-SYNC is disabled, there's no tearing in-game when there should be. The only way to fix it is to reboot the system. To get G-SYNC working again, you need to disable the overclock. We're leaving the maximum VRR range at 144Hz since it doesn't work properly at 160Hz.
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 160Hz 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.