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 reflection 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.
Update 02/26/2021: We retested the input lag with the latest firmware. The refresh rate can now be overclocked up to 160Hz. You can get 160Hz with 10-bit color depth at 4k with Display Stream Compression over DisplayPort. The input lag has increased from 4.1 ms at 144Hz to 7.6 ms at 160Hz.
The LG 27GN950-B has incredibly low input lag, resulting in a responsive gaming experience. It increases slightly in HDR, but it shouldn't be noticeable for most people.
The LG 27GN950 has an outstanding resolution and size. The 4k screen delivers crisp images and there's enough space to open multiple windows at once. If you don't need a 4k resolution and prefer a 1440p option, check out the LG 27GN850-B.
While we don't specifically test for it, many users have reported that the monitor sometimes doesn't wake up from sleep mode, requiring users to unplug and plug it back in to solve the issue. Also, when waking the monitor up in a dual setup, opened windows shift to the second screen.
Since the LG 27GN950 supports HDMI 2.0 and not HDMI 2.1, you can only achieve 4k @ 60Hz over an HDMI connection. You can achieve 4k @ 160Hz over a DisplayPort connection if your graphics card has support for VESA Display Stream Compression (DSC). Also, LG advertises that there's a USB-C input, but there isn't one. If you want a monitor with HDMI 2.1 support, then check out the Acer Nitro XV282K KVbmiipruzx.
The LG 27GN950-B has a few extra features including DisplayPort 1.4 Display Stream Compression support. There's RGB illumination on the back, but the LG UltraGear Control Center doesn't appear to work on this monitor, so we weren't able to customize the RGB settings. If you have this monitor and it works, let us know. You can also add a virtual crosshair on the screen for FPS games.
There are a joystick and a dial underneath the center of the monitor to control the on-screen menu.
We reviewed the 27 inch LG 27GN950-B, which is the only size available for this model. There are other models in LG's UltraGear lineup, some of which are listed below.
If someone comes across a different type of panel or if their 27GN950-B doesn't correspond to our review, let us know and we'll update the review. Note that some tests, such as the gray uniformity, may vary between individual units.
|Model||Size||Panel Type||Resolution||Refresh Rate||Native VRR||Notes|
|LG 27GL650F-B||27"||IPS||1080p||144Hz||FreeSync, NVIDIA Certified|
|LG 27GN750-B||27"||IPS||1080p||240Hz||FreeSync, NVIDIA Certified|
|LG 27GL850-B||27"||IPS||1440p||144Hz||FreeSync, NVIDIA Certified|
|LG 27GN850-B||27"||IPS||1440p||144Hz||FreeSync, NVIDIA Certified|
|LG 27GN950-B||27"||IPS||4k||160Hz||FreeSync, NVIDIA Certified|
|LG 34GN850-B||34"||IPS||3440x1440||160Hz||FreeSync, NVIDIA Certified|
The unit we reviewed was manufactured in August 2020, and you can see the label here.
The LG 27GN950-B is a great 4k gaming monitor with a high native refresh rate. It's one of the few 4k monitors we've tested that has such a high refresh rate, and it costs less than some of its competitors, such as the Acer Predator XB273K. However, you need a high-end graphics card to take full advantage of it, and it may be worth it to get a cheaper, 1440p monitor instead. Also see our recommendations for the best gaming monitors, the best 4k monitors, and the best monitors for PS5.
Overall, the ASUS ROG Strix XG27UQ and the LG 27GN950-B are very similar, but the LG has a slightly higher refresh rate of 160Hz. The ASUS is better a choice if you need swivel adjustments, and it has better reflection handling for gaming in a bright room. It has a Black Frame Insertion feature that the LG doesn't have, but it causes slight image duplication and may not be to everyone's liking. The LG has wider viewing angles that are more ideal for sharing content or playing co-op games, and it gets a lot brighter in HDR, although the brightness isn't as consistent. It has a faster response time as well, which results in clearer images in fast-moving scenes.
The LG 27GN950-B and the Gigabyte M27Q are both great gaming monitors. The LG has a higher resolution than the Gigabyte, but the difference in sharpness might not be noticeable for most people at typical viewing distances. Gaming-wise, they're very similar; the Gigabyte has a slightly higher refresh rate, but the LG has a better response time. The Gigabyte has more features, like USB-C input, a Picture-in-Picture mode, and a built-in KVM switch.
The Samsung Odyssey G7 LC32G75T is better than the LG 27GN950-B. The Samsung has a VA panel with a much better contrast ratio, and it has a higher 240Hz refresh rate. The Samsung also has a Black Frame Insertion feature and slightly lower input lag. However, the LG has an IPS panel with wide viewing angles, it gets brighter, and has a higher 4k resolution.
The Acer Nitro XV282K KVbmiipruzx and the LG 27GN950-B are both great 4k monitors with mainly similar features. However, the Acer has HDMI 2.1 inputs, so you can reach 144Hz with a 4k resolution over HDMI, and the LG has HDMI 2.0 inputs, so you can only hit 60Hz. The Acer has much better ergonomics because it offers a full 360-degree swivel range. The LG gets brighter, but the Acer has better reflection handling, so they perform about the same in well-lit rooms.
The Gigabyte M28U is slightly better overall than the LG 27GN950-B for most users. The Gigabyte has much better reflection handling, but it's not quite as bright as the LG, so if you're in a bright room, the LG might be the better choice. The Gigabyte is better for gaming, with two HDMI 2.1 ports for next-gen console gamers and a black frame insertion feature that works even with VRR enabled. The LG has a better response time and lower input lag, though.
The Dell S2721DGF is slightly better than the LG 27GN950-B for gaming. The Dell has much better ergonomics, significantly better reflection handling, a lower input lag, and a slightly quicker response time at its max refresh rate. However, the LG has a higher 4k resolution, better out-of-the-box color accuracy, a quicker response time, and a lower input lag at 60Hz.
The LG 27GN950-B and the Acer Predator XB273K Pbmiphzx are similar-performing monitors. The LG has native FreeSync support, it gets much brighter, has a much quicker response time, and lower input lag at 60Hz. However, the Acer has native G-SYNC support, better ergonomics, much better reflection handling, and it has built-in speakers.
The LG 27GN950-B is slightly better overall than the LG 27UK650-W, mainly due to the extra gaming features. The 27GN950-B has a max 144Hz refresh rate, it gets brighter, has a much quicker response time, and lower input lag. However, the 27UK650-W delivers clearer text and has better reflection handling.
The LG 27GN950-B and the ASUS ROG Strix XG27AQ are both impressive gaming monitors with different resolutions. The ASUS is a 1440p monitor, while the LG is a 4k monitor that delivers a sharper image. The LG also has a slightly faster response time, delivering exceptionally smooth motion, although its refresh rate maxes out at 160Hz whereas the ASUS can reach 170Hz. Both have VRR support and low input lag. While the LG has a slight edge when it comes to performance, the ASUS feels better built and has better ergonomics and reflection handling, if these are important to you.
The Acer Predator X27 is slightly better than the LG 27GN950-B. The Acer has native G-SYNC support, better ergonomics, it gets significantly brighter in HDR, and has better reflection handling. However, the LG has a quicker response time, lower input lag, and it gets brighter in SDR.
The LG 27GN950-B is better overall than the LG 27GN750-B. The 27GN950-B is a 4k monitor with a slightly quicker response time, a wide color gamut for HDR content, and it gets brighter. On the other hand, the 27GN750-B is a 1080p monitor with a much higher 240Hz refresh rate, slightly lower input lag, and it has better reflection handling.