The LG UltraGear 27GX790B-B QHD Dual Mode G-Sync HDR OLED 26.5in Gaming Monitor features a 2560x1440 max resolution and dual mode technology, allowing users to switch between 540Hz at QHD and a blisteringly fast 720Hz at HD for ultra-responsive gameplay. Including a 0.02ms (GtG) response time, G-Sync support, Black Stabiliser, Dynamic Action Sync, DisplayHDR True Black 500, and a fully adjustable stand supporting tilt, height, swivel and pivot functionality. This monitor provides a competitive edge, immersion and an ergonomic design assisting in extended gaming sessions.
Features
LG UltraGear™ GX7 27-inch 4th Gen. OLED QHD 540Hz Gaming Monitor with Dual Mode
LG UltraGear 27-inch 4th Gen. OLED QHD Gaming Monitorㅣ27GX790B with Dual Mode (720Hz@HD, 540Hz@QHD), 0.02ms(GtG), DP2.1, VESA DisplayHDR™ True Black 500.
- 27-inch QHD (2560x1440) OLED display
- VESA DisplayHDR™ True Black 500
- OLED with QHD 540Hz - HD 720Hz Dual-Mode
- 0.02ms (GtG) response time
- NVIDIA® G-SYNC® Compatible / VESA Certified AdaptiveSync / AMD FreeSync™ Premium Pro
- Ergonomic design with tilt, swivel, pivot, adjustable height and wall-mountable
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
Display
LG's Brightest 4th Gen OLED
Introducing LG’s gaming monitor powered by 4th Gen OLED with revolutionary Primary RGB Tandem technology—reaching up to 1500 nits of peak brightness for visibly clearer gameplay (As of November 2025, among all LG models using WOLED prior to 4th Gen. OLED, 27GX790B offers the highest brightness.), helping you to see on-screen visuals with clarity even in bright environments. In fast-paced or sunlit in-game scenes, enhanced APL and reduced ABL help maintain consistent luminance without dimming critical visuals. With UL Verified Perfect Black, Colour and VESA DisplayHDR™ True Black 500, this next-gen OLED delivers the contrast and clarity gamers need to react faster, see more, and stay immersed in every frame.
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
Next-Gen OLED Brilliance
Powered by 4th Gen Primary RGB Tandem OLED, the 27GX790B delivers brighter (As of November 2025, among all LG models using WOLED prior to 4th Gen. OLED, 27GX790B offers the highest brightness.) visuals with less power than the previous 3rd Gen LG OLEDs—reaching up to 1500 nits of peak brightness. Its advanced 4-stack RGB structure produces deeper contrast, sharper detail, and stunning colour precision. Experience clearer shadows, deep immersion, and visual consistency in every frame—built for serious gaming.
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
UL-Verified Brilliant Visual Experience in Both Low and Bright Light
Perfect Black
Delivers true black levels to enhance perceived brightness and contrast, whether it's bright or dark around you.
True Colour
Delivers accurate colour expression even under varying lighting conditions.
Content Reproduction
Actual game content is faithfully rendered on screen, maintaining intended colour and detail in both dark and bright environments.
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
Desk peripherals are not included.
Deep Detail with VESA DisplayHDR™ True Black 500
Experience deep, lifelike visuals with VESA DisplayHDR™ True Black 500, delivering precise black tones even in the darkest scenes. The monitor’s DCI-P3 99.5% (Typ.) colour gamut ensures colours are presented with accurate detail, reflecting the original intent.
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
UL-Verified Advanced Eye Comfort Technologies
LG UltraGear's UL-verified advanced eye comfort technologies minimise frustrating reflections and are designed with visual comfort in mind, delivering crystal-clear gaming performance with consistent clarity. With UL verifications in key areas—reducing screen flicker, minimising discomfort glare—these technologies promote visual comfort and contribute to a smoother gaming experience, whether you’re gaming in bright environments or LED-lit rooms.
*All pictures shown are simulated for illustration purpose only.
*LG WOLED has been verified as Flicker-Free, Discomfort Glare Free, and Eyesafe 3.0 by UL.
*Certificate Number: Flicker-Free Display (OLED) - A196009, Discomfort Glare Free - V563481 (conditions of UGR less than 22), Eyesafe 3.0 CPF60 - V745354, Eyesafe 3.0 RPF40 - V275741
*The above feature may vary depending on the user’s computing environment or conditions.
Speed
720Hz(@HD) – 540Hz(@QHD) Dual-Mode with Customisable Settings
With VESA Certified Dual-Mode, enjoy UltraGear’s fastest performance with up to 720Hz refresh rate—the highest ever introduced. Seamlessly switch between QHD 540Hz for detailed visuals and HD 720Hz for ultra-fast action. Choose your preferred refresh rate and screen size via On-Screen Display, or toggle instantly through LG Switch for optimised gameplay across every genre.
High-Speed Bandwidth with DisplayPort 2.1
The 27GX790B features DisplayPort 2.1, delivering high-bandwidth connectivity designed for ultra-fast gaming and stable performance even at extreme refresh rates. Complementing this, the USB-C port enables streamlined single-cable display output and data transfer, supporting flexible setups with minimised clutter. Dual HDMI 2.1 ports complete the configuration, helping to ensure smooth integration with gaming PCs and the latest consoles for a fully connected, high-performance environment.
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
DP, HDMI cables are included with the monitor.
The graphics card is NOT included and should be purchased separately.
Immersive Gaming Powered by Extreme Speed
The ultra-fast 0.02 response time (GtG) (Select 'Faster Mode' to perform '0.02ms Response Time'. (Game Adjust → Response Time → Faster Mode).) reduces reverse ghosting and provides fast response times, letting you enjoy a whole new gaming performance.
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
Technology
Certified Using Industry-Standard Technology
Powered by AMD FreeSync™ Premium Pro, NVIDIA-validated G-SYNC® compatibility, and VESA AdaptiveSync™ certification, this monitor delivers tear-free visuals, smooth motion, and low latency for precise, fluid gaming performance.
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
The feature’s performance is evaluated against models that do not use sync technology.
Errors or delays may occur depending on the stability of the network connection.
ClearMR 21000 for Sharp and Clean Motion
VESA ClearMR 21000 certification ensures this monitor accurately renders even subtle motion blur around the edges of moving objects, delivering sharp, detailed visuals during fast-paced action. Designed for precision, it helps you stay focused and push towards victory.
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
Dynamic Action Sync
Dynamic Action Sync Mode allows gamers to see the action as it occurs in real time so that they can react immediately rather than respond after the delay of internal frame processing.
Black Stabiliser
Black Stabiliser Mode brightens dark areas and gives you better visibility in dark scenes. It can make dark areas brighter to help you find the enemy or game objectives hidden in the dark.
Crosshair
The Crosshair feature helps enhance accuracy in first-person shooter games.
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
Smart Control, Seamless Switching by LG Switch
The LG Switch app optimises your monitor for both gaming and everyday life. Effortlessly manage your monitor settings—adjust image quality and brightness to your preference, then apply your settings instantly using a hotkey. The app also lets you split the screen into 11 layouts and launch your video call platform in a click—adding convenience and flexibility to your setup.
This video is for LG Switch illustrative purposes only and may not reflect the actual 27GX790B product specifications.
To download the latest LG Switch app, search for 27GX790B in the LG.com Support Menu.
Plugin for Immersive Sound Effect
Enjoy gaming with seamless voice chat through easy 4-pole headphone out connectivity. Enhance immersion with DTS Headphone:X, delivering virtual 3D sound for a more engaging experience.
Headsets need to be purchased separately.
Compact and Sleek Design
Experience a virtually borderless design paired with a fully adjustable stand offering swivel, tilt, and height control. The slim, space-saving base and wide swivel range are engineered to maximise desk space efficiency while giving your setup a clean, refined look.
- Swivel -30° ~ 30°
- Tilt -5° ~ 21°
- Height 110mm
- Pivot Clockwise
- DisplayPort2.1 x1 with DSC
- USB Type-C™ (DP alt.) x1
- HDMI™ 2.1 x2
- USB3.0 2dn
Images have been simulated to enhance feature understanding, and may differ from actual use experience.
Desk peripherals are not included.
Backed by a 2 year LG warranty.
