LG 27GX790B-B 27” Ultragear QHD (3440 x 1440) OLED Gaming Monitor, Dual Mode (QHD 540Hz/ HD 720Hz), 0.02ms, TrueBlack 500, NVIDIA G-Sync Compatible, AMD FreeSync Premium Pro, DP 2.1, USB-C, Black

Outrageous Speed with LG's Brightest OLED Gaming Monitor - Experience the brightness and speed of 4th Gen OLED on a vivid 27" QHD display—engineered for ultra-smooth, tear-free gameplay. With a refresh rate up to 720Hz and lightning-fast 0.02ms response time, you’ll react faster, track every movement with precision, and outpace your opponents frame by frame with astounding brightness, clarity and speed.
Our Brightest, Boldest OLED Gaming Monitor - Powered by UltraGear’s latest OLED with Primary RGB Tandem tech, this is LG’s brightest OLED gaming monitor yet—reaching 335 nits typical brightness for clear visibility in bright scenes. Enhanced APL and reduced ABL keep critical visuals sharp during intense action, while UL Verified Perfect Black and DisplayHDR True Black 500 deliver deep contrast and pinpoint detail.
Next-Gen OLED Brilliance - 4th Gen Primary RGB Tandem OLED reaches 335 nits typical brightness while using less power than previous UltraGear OLED generations. The display's advanced 4-stack RGB structure delivers enhanced contrast, sharper detail, and color precision that stays consistent across every frame.
Dual Mode: QHD 540Hz for Detail or HD 720Hz for Speed - Dual Mode pushes gaming speed to the edge, letting you toggle between QHD resolution at 540Hz or HD at 720Hz from a hotkey. Gain outrageous speed and responsiveness for split-second decisions and competitive domination.
DisplayPort 2.1 Delivers Next-Gen Gaming Speed - DisplayPort 2.1 unlocks ultra-fast data speeds for stable, high-refresh gaming up to 720Hz. USB-C keeps your setup clean with single-cable output, and dual HDMI 2.1 ports connect seamlessly to today’s top consoles. More bandwidth. More clarity. More ways to win.
A Virtually Instantaneous 0.02 Response Time (GtG) - The ultra-fast 0.02 response time (GtG), reducing reverse ghosting and providing fast response time, lets you to enjoy a whole new gaming performance.
NVIDIA G-SYNC Compatible & AMD FreeSync Premium Pro - NVIDIA G-SYNC Compatible and AMD FreeSync Premium Pro deliver smooth, tear-free, low-latency gaming with high refresh rates—so every frame stays fluid and sharp.
UL-Verified for a "Perfect" Visual Experience - UL-verified Perfect Reproduction delivers that actual game content is faithfully rendered on screen, maintaining intended color and detail in both dark and bright environments. Unlike static image-based metrics, this certification reflects real-world content reproduction accuracy.
Deeper Detail with VESA DisplayHDR True Black 500 - Experience breathtaking realism with VESA DisplayHDR True Black 500, delivering nuanced shadow detail and rich black expression—even in the darkest game scenes. A 1.5 million:1 contrast ratio pairs with up to 99.5% (typical), DCI-P3 color gamut and Delta E≤2 color accuracy, to ensure colors are vivid, precise, and true to the creator’s intent—giving gamers and creators alike the confidence to see every frame as it was meant to be seen.
Five UL Certifications. One Clear Advantage for Eye Comfort. - This UltraGear OLED display is five times UL-certified5—for Anti-Glare, Flicker-Free, Low Blue Light, Reduced Blue Light, and Reduced Circadian Stimulating Blue Light. Combined with a matte anti-glare finish, the display helps reduce distractions, keep your view crisp, and maintain visual comfort—so you can stay focused and perform at your best, even during extended gaming sessions.

The LG UltraGear OLED 27GX790B is built for gamers who want every visual and competitive advantage. UltraGear's 27-inch 4th Generation OLED QHD resolution display delivers pinpoint clarity with UL Verified Perfect Black and Perfect Color¹, exposing incredible detail and nuanced highlights. VESA DisplayHDR True Black 500 adds deeper contrast and controlled brightness, giving gamers a sharper read on enemies, environments, and effects in every gaming scenario.Speed is where this UltraGear OLED separates itself from others. Dual Mode² gives gamers two elite paths to victory: a 540Hz refresh rate at QHD resolution for high-resolution precision or 720Hz at HD for pure, unleashed speed. Paired with a near-instantaneous 0.02ms response time, motion stays clean and fast—ideal for tracking targets, reacting faster, and winning close engagements.Your frames stay stable under pressure with NVIDIA G-SYNC compatibility and AMD FreeSync Premium Pro³, delivering tear-free, low-latency performance. VESA Certified ClearMR backs it up with verified motion-blur clarity, keeping visual noise out of the fight.For next-gen setups, DisplayPort 2.1 ensures maximum bandwidth for high refresh rates and smooth data flow. A 4-pole headphone jack supports game audio and comms through one connection. And with full ergonomic control—height, tilt, swivel, and pivot—you can dial in your perfect competitive setup.The 27GX790B delivers elite OLED performance, breakthrough speed, and incredible performance built for players who refuse to settle.Source: Circana, LLC, Retail Tracking, Monitors, Gaming Designed, Display Type: OLED, Dollars, Jan - Dec 2025¹This LG OLED panel has been certified with “Perfect Black”, “Perfect Color with 100% Color Fidelity” and “Perfect Reproduction”. Certificate Number: Perfect Black (OLED)- V183632, Perfect Color V569367 – “Perfect Reproduction” V756760 by UL.²Requires graphics card that support up to 720Hz refresh rate (Full HD). Actual refresh rates may vary depending on computer graphics specifications and configurations. Graphics card available separately.³NVIDIA G-SYNC Compatible supports variable refresh rate on GeForce GTX 10 Series and higher GPUs on Display Port, and GeForce RTX 30 Series and higher GPUs on HDMI 2.1.⁴Requires graphics card that supports 720Hz refresh rate support (HD). Actual refresh rates may vary depending on computer graphics specifications and configurations.⁵LG OLED panels have been certified as Flicker-Free, Discomfort Glare Free, Low Blue Light, Verified Reduced Blue Light and Verified Reduced Circadian Stimulating Blue Light by UL. Certificate Number: Flicker Free Display (OLED)- A196009, Discomfort Glare Free - V563481 (conditions of UGR less than 22), Low Blue Light Hardware Solution Platinum - V745051. Verified for reduced circadian stimulating blue light (V745354). Verified for reduced blue light (V275741).⁶Headphones sold separately. For DTS patents, see http://patents.dts.com. Manufactured under license from DTS, Inc. or its affiliates. DTS trademarks and logos are registered trademarks or trademarks of DTS, Inc. in the United States and other countries. ALL RIGHTS RESERVED.⁷To download the latest version of the LG Switch app, visit LG.com.