27-inch 4th Gen. OLED QHD 540Hz Gaming Monitor with Dual Mode. The LG UltraGear 27GX790B pushes every boundary of gaming monitor technology — delivering LG's brightest 4th Gen OLED panel, a record-breaking 720Hz Dual Mode, and 0.02ms response time in a sleek, borderless design.

Key Features

720Hz(HD) / 540Hz(QHD) Dual Mode World's fastest UltraGear — switch between QHD for detail and HD for ultra-speed via VESA Certified Dual Mode.

4th Gen Primary RGB Tandem OLED Up to 1500 nits peak brightness — LG's brightest OLED gaming panel to date.

VESA DisplayHDR™ True Black 500 Deep, precise black levels and DCI-P3 99.5% colour gamut for lifelike, faithful visuals.

0.02ms (GtG) Response Time Ultra-fast pixel response in Faster Mode eliminates ghosting and reverse ghosting.

AMD FreeSync™ Premium Pro & NVIDIA G-SYNC® Compatible Tear-free, stutter-free visuals validated by both major GPU manufacturers plus VESA AdaptiveSync™.

VESA ClearMR 21000 Certified Precisely accurate motion rendering — sharp moving objects, no trailing blur in fast-paced scenes.

DisplayPort 2.1 + Dual HDMI 2.1 + USB-C High-bandwidth connectivity for extreme refresh rates — PC, console, and single-cable setups covered.

UL-Verified Eye Comfort Technologies Flicker-Free, Discomfort Glare Free, Low Blue Light and Eyesafe 3.0 certifications from UL Solutions.

DISPLAY — LG's Brightest 4th Gen OLED

LG's Brightest 4th Gen OLED

Powered by 4th Gen Primary RGB Tandem OLED with revolutionary 4-stack RGB structure, the 27GX790B reaches up to 1500 nits peak brightness — the highest ever from an LG WOLED gaming monitor. Enhanced APL and reduced ABL maintain consistent luminance in fast-paced or sunlit scenes without dimming critical visuals. UL Verified Perfect Black, True Colour, and VESA DisplayHDR™ True Black 500 certification deliver the contrast and clarity gamers need to react faster and stay immersed in every frame.

*As of November 2025, among all LG models using WOLED prior to 4th Gen. OLED, 27GX790B offers the highest brightness.

UL-Verified Perfect Visuals

UL Solutions independently verifies three key areas — Perfect Black (true zero-light black levels), True Colour (accurate colour across all lighting conditions), and Content Reproduction (faithful rendering of intended colour and detail in both dark and bright environments). Real game content looks exactly as designed.

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 creative intent.

UL-Verified Advanced Eye Comfort

The anti-glare, low-reflection (AGLR) LG WOLED panel carries UL Solutions verification for Flicker-Free, Discomfort Glare Free, Low Blue Light (Hardware Platinum), Eyesafe 3.0 CPF60, and Eyesafe 3.0 RPF40 — designed to reduce reflections and support consistent picture quality in both bright and low-light viewing environments.

*LG WOLED screens have been verified as Flicker-Free, Discomfort Glare Free, and Low Blue Light by UL. Verification applies to specific performance attributes under defined test conditions.

SPEED — 720Hz Dual Mode & 0.02ms Response

720Hz(HD) – 540Hz(QHD) VESA Certified Dual Mode

The highest refresh rate ever introduced on an UltraGear monitor. With VESA Certified Dual Mode, seamlessly switch between QHD 540Hz for detailed, immersive visuals and HD 720Hz for ultra-fast competitive action. Select your preferred mode via the On-Screen Display or toggle instantly through the LG Switch app — optimised for every genre.

0.02ms (GtG) Response Time

Select Faster Mode (Game Adjust → Response Time → Faster Mode) to achieve 0.02ms GtG response. This ultra-fast pixel transition minimises reverse ghosting and provides the clean, sharp motion needed for competitive play at the highest refresh rates.

CONNECTIVITY — DisplayPort 2.1, Dual HDMI 2.1, USB-C

High-Speed Bandwidth with DisplayPort 2.1

DisplayPort 2.1 (with DSC) delivers high-bandwidth connectivity designed for ultra-fast gaming and stable performance at extreme refresh rates. The USB-C port enables streamlined single-cable display output and data transfer. Dual HDMI 2.1 ports ensure smooth integration with gaming PCs and the latest consoles. DP and HDMI cables are included.

DP and HDMI cables are included with the monitor. Graphics card not included and must be purchased separately.

TECHNOLOGY — Certified Gaming Standards

Certified Using Industry-Standard Technology

Powered by AMD FreeSync™ Premium Pro, NVIDIA G-SYNC® Compatible validation, and VESA AdaptiveSync™ certification — this monitor delivers tear-free visuals, smooth motion, and low latency for precise, fluid gaming performance across all GPU platforms.

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 — stay focused and push towards victory.

Gaming Features

Dynamic Action Sync

See the action as it happens in real time. Dynamic Action Sync bypasses internal frame processing to reduce input lag, letting you react immediately rather than responding after a delay.

Black Stabiliser

Brighten dark areas and gain visibility in shadowy scenes. Black Stabiliser Mode reveals enemies and objectives hidden in the dark without washing out bright areas.

Crosshair Overlay

Improve targeting accuracy in first-person shooters with the built-in Crosshair feature — overlays a precision reticle directly on screen regardless of in-game settings.

Smart Control — Seamless Switching by LG Switch

The LG Switch app optimises your monitor for gaming and everyday life. Adjust image quality and brightness, then apply settings instantly with a hotkey. Split the screen into 11 different layouts, launch video call platforms with a single click, and toggle between Dual Mode presets — all without touching the monitor's OSD.

To download the latest LG Switch app, search for 27GX790B in the LG.com Support Menu.

DTS Headphone:X — Immersive 3D Audio

Connect any 4-pole headset for seamless voice chat and gaming audio. DTS Headphone:X delivers virtual 3D surround sound — enhanced positional audio that puts you deeper into the game. Headset sold separately.

DESIGN — Compact, Sleek & Fully Adjustable

Virtually Borderless with Full Ergonomic Adjustability

A virtually borderless display paired with a slim, space-saving base keeps your desk clean and refined. The fully adjustable stand provides complete ergonomic control so you can dial in the perfect gaming position.

Images have been simulated to enhance feature understanding and may differ from actual use experience. Desk peripherals are not included.