The LG 27GX790B-B is a premium 27-inch, 1440p OLED gaming monitor. It's a newer version of the LG 27GX790A-B with a higher native 540Hz refresh rate. It also has a Dual-Mode feature to boost it to 720Hz with a lower 720p resolution. Like the older LG 27GX700A-B, this one also uses an RGB Tandem OLED panel, providing better brightness and improved color purity than older-generation WOLED panels. It competes with other models with the same panels and specs, like the ASUS ROG Swift OLED PG27AQWP-W, which uses a glossy coating rather than this monitor's matte coating. The LG has typical gaming features like FreeSync Premium Pro, G-SYNC Compatibility, and HDMI and DisplayPort 2.1 ports. It even has a small USB hub that includes DisplayPort Alt Mode, and its audio jack supports DTS Headphone:X to simulate surround sound audio.
Our Verdict
The LG 27GX790B-B is remarkable for PC gaming. It has a native 1440p resolution and 540Hz refresh rate, offering fairly detailed images alongside a smooth feel. It also has a dual-mode feature to boost its refresh rate to 720Hz with a lower 720p resolution, giving it versatility for playing different types of games. Motion looks sharp thanks to its near-instantaneous response time, and it has low input lag in its gaming picture modes. Games also look fantastic thanks to the monitor's high contrast ratio, bright highlights, and wide range of colors, but it has accuracy issues in HDR. A downside is that it exhibits distracting VRR flicker when the frame rate changes quickly.
1440p, 540Hz & 720p, 720Hz dual modes.
Very sharp motion at any refresh rate.
Low input lag in certain gaming picture modes.
High-bandwidth DisplayPort & HDMI ports.
Deep blacks & no haloing.
Makes highlights pop in HDR.
Colors aren't as bright as pure white.
Distracting VRR flicker.
Overbrightens content in HDR.
The LG 27GX790B-B is fantastic for console gaming. It supports most signals from gaming consoles thanks to its HDMI 2.1 bandwidth, but it has to downscale 4k signals. On the plus side, fast-moving content looks crisp thanks to its near-instantaneous response time. It also has low input lag in its gaming picture modes, offering a responsive feel. Plus, it displays deep blacks in dark rooms, makes highlights pop, and offers a wide color gamut for an impactful HDR gaming experience. However, it overbrightens content in HDR.
Very sharp motion at any refresh rate.
Low input lag in certain gaming picture modes.
Deep blacks & no haloing.
Makes highlights pop in HDR.
Supports most signals from consoles.
Has to downscale 4k signals to 1440p.
Colors aren't as bright as pure white.
The LG 27GX790B-B is good for office use, but there are some limitations. It's fine if you want to use it in a room with a few lights around, as its matte coating reduces glare well. However, it doesn't get bright enough to fight intense glare in sunny environments. It risks burn-in with constant exposure to the same static elements over time, too. It also has fringing around text, which is problematic if you read a lot of documents. On the plus side, it comes with an ergonomic stand and a USB-C port for quickly connecting a laptop, but it's limited to 5W of power delivery, which isn't enough to charge a laptop while you're using it.
Matte coating reduces reflections well.
Ergonomic stand.
Supports DisplayPort Alt Mode over USB-C.
Struggles fighting intense glare.
Risk of burn-in.
Fringing around text.
USB-C is limited to 5W of power delivery.
The LG 27GX790B-B is excellent for editing. Its biggest strength is its picture quality, which offers deep blacks, no haloing, and a wide range of colors. It also includes an accurate sRGB mode that locks colors to the sRGB color space. However, other picture modes are less accurate and can be difficult to properly calibrate. It doesn't get bright enough to fight glare in sunny rooms either, but its matte coating absorbs light well from smaller sources, like a lamp. Unfortunately, there's fringing around text and some images due to the monitor's subpixel layout.
Deep blacks & no haloing.
Makes highlights pop in HDR.
Matte coating reduces reflections well.
Ergonomic stand.
Supports DisplayPort Alt Mode over USB-C.
Accurate out-of-the-box sRGB mode.
Struggles fighting intense glare.
Risk of burn-in.
Fringing around text.
USB-C is limited to 5W of power delivery.
Can be difficult to calibrate outside of sRGB mode.
The LG 27GX790B-B has good brightness. It's fine if you want to use it in a dim or moderately-lit room, but it doesn't get bright enough to fight a ton of glare. On the plus side, it gets fairly bright in HDR and makes small highlights really pop.
Makes highlights pop in HDR.
Struggles fighting intense glare.
The LG 27GX790B-B has a near-instantaneous response time for very sharp motion.
Very sharp motion at any refresh rate.
The LG 27GX790B-B has amazing HDR picture quality. It displays deep blacks alongside bright highlights without haloing. It also displays a wide range of colors, but colors aren't as bright and vivid as pure white.
Deep blacks & no haloing.
Displays wide range of colors.
Colors aren't as bright as pure white.
The LG 27GX790B-B has remarkable SDR picture quality. Blacks are deep and inky, and the monitor displays a wide range of colors.
Deep blacks & no haloing.
Displays wide range of colors.
The LG 27GX790B-B has incredible color accuracy. Its sRGB mode locks colors well to the sRGB color space and has minimal accuracy. Other picture modes are less accurate, though, and are difficult to calibrate with the monitor's settings. You need a full calibration to properly calibrate these other modes.
Accurate out-of-the-box sRGB mode.
Can be difficult to calibrate outside of sRGB mode.
Performance Usages
Changelog
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Updated Mar 18, 2026:
We corrected a mistake that stated it doesn't have a dual-mode setting, when it in fact does.
-
Updated Mar 17, 2026:
We clarified that this monitor competes against the ASUS ROG Swift OLED PG27AQWP-W. We also further detailed its panel technology.
- Updated Mar 17, 2026: We've converted this review to Test Bench 2.1.2. We added a new Panel Technology box, including the Spectral Power Distribution (SPD) graph.
- Updated Feb 25, 2026: Review published.
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Differences Between Sizes And Variants
We bought and tested the 27-inch LG 27GX790B-B, which is the only size available. Despite sharing a similar name, it's different than the LG 27GX790A-B and the LG 27GX700A-B, which you can see below.
| Model | Panel Type | Refresh Rate | Resolution | DisplayPort Version | USB Ports |
|---|---|---|---|---|---|
| 27GX700A-B | RGB Tandem WOLED | 280Hz | 1440p | 1.4 | 2x USB-A |
| 27GX790A-B | 3rd-gen WOLED | 480Hz | 1440p | 2.1 | 2x USB-A |
| 27GX790B-B | RGB Tandem WOLED |
540Hz (720Hz Dual-Mode) |
1440p (720p Dual-Mode) |
2.1 |
2x USB-A 1x USB-C |
Our unit's label indicates it was manufactured in December 2025 in China.
Popular Monitor Comparisons
The LG 27GX790B-B is a premium OLED gaming monitor with a 27-inch screen and 1440p resolution. Its native 540Hz refresh rate is the fastest refresh rate you can get on any OLED monitor at the time of its release, and it offers versatility with its 720Hz, 720p dual-mode feature. This makes it a fantastic choice for playing games that benefit from high frame rates. It also offers the necessities for gaming, like VRR support, sharp motion, and low input lag. Its HDMI and DisplayPort 2.1 ports are useful if you have a high-end graphics card.
Besides its premium gaming performance, its RGB Tandem OLED panel brings higher brightness and better color purity than previous-generation OLEDs, like the LG 27GX790A-B. It's not without its flaws, though, as it overbrightens content in HDR. You may also prefer waiting for the ASUS ROG Swift OLED PG27AQWP-W if you want a similar option with a glossy coating instead of this monitor's matte screen. Regardless, it's one of the better gaming monitors out there, and it's worth considering if you want higher refresh rates than what's available on current QD-OLED monitors, like the ASUS ROG Strix OLED XG27ACDNG.
Also see our recommendations for the best high refresh rate monitors, the best 1440p gaming monitors, and the best LG monitors.
The LG 27GX790A-B and the LG 27GX790B-B are both high-end OLED gaming monitors, with a few differences. The 27GX790B-B uses an RGB Tandem OLED panel that allows it to get brighter and display more vivid colors than the older panel of the 27GX790A-B. They each have high refresh rates, but the 27GX790B-B has a dual-mode feature to raise it to 720Hz with a 720p resolution, giving it more versatility for playing different types of games. The 27GX790B-B even offers a more accurate sRGB mode, which is worth considering for content creation.
The LG 27GX790B-B and the LG 27GX700A-B are both RGB Tandem OLEDs, with a few differences. The main difference is that the 27GX790B-B has a higher 540Hz refresh rate with a dual-mode feature to boost it to 720Hz with a 720p resolution. This makes it more versatile for playing different types of games. The two monitors are similar for the most part, otherwise, but the 27GX700A-B is more accurate in its gaming picture modes.
The ASUS ROG Swift OLED PG27AQWP-W and the LG 27GX790B-B are competing 1440p gaming monitors with the same Tandem OLED panel. They each have a native 540Hz refresh rate with a 1440p resolution and a 720Hz refresh rate with a lower 720p resolution. The main difference comes down to their screen coatings, as the ASUS has a glossy screen while the LG has a matte screen. This means images are clearer on the ASUS, whereas the LG absorbs light better. There are some other minor differences, as the ASUS has higher DisplayPort bandwidth, but the LG has a USB-C port to quickly connect a laptop.
The LG 27GX790B-B is a higher-end 1440p gaming monitor than the ASUS ROG Strix OLED XG27AQDMG. The main advantage of the LG is that it has a higher 540Hz refresh rate with a dual-mode feature to boost it to 720Hz with a 720p resolution. This makes the LG the better choice if you want a smoother feel while playing games at high frame rates. The LG also uses an RGB Tandem OLED panel that gets brighter and displays more vivid colors than the ASUS. Plus, the LG has a few extra features, like HDMI and DisplayPort 2.1 bandwidth ports, which the ASUS doesn't have.
We buy and test more than 30 monitors each year, all of which we purchase ourselves, without cherry-picked units or samples. We put a lot into each unbiased, straight-to-the-point review, and there's a whole process from purchasing to publishing, involving multiple teams and people. We do more than just use the monitor for a week; we use specialized, custom tools to measure various aspects and deliver objective, data-driven results. We also consider multiple factors before making any recommendations, including the monitor's cost, its performance compared to the competition, and whether it's easy to find.
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