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LG UltraGear 27GX790B-B 26.5" 16:9 Dual Mode WQHD 540Hz and HD 720Hz OLED HDR Gaming Monitor

SKU: LG27GX790BB MFR: 27GX790B-B
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Key Features

  • Experience incredibly fluid gameplay with a 540Hz refresh rate and 0.02ms response time on this OLED gaming monitor.
  • Immerse yourself in stunning visuals with WQHD resolution and vibrant DCI-P3 99.5% color gamut for lifelike graphics.
  • Enjoy tear-free gaming thanks to AMD FreeSync Premium Pro and NVIDIA G-Sync compatibility, ensuring smooth performance.
  • Connect all your devices effortlessly with versatile HDMI 2.1, DisplayPort 2.1, and USB-C inputs.
  • Optimize your viewing comfort with tilt, height, swivel, and pivot adjustments for the perfect ergonomic setup.
  • Dive into rich, detailed sound with DTS Headphone:X, enhancing your audio experience for every game.
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Temporarily On Backorder?Expected Availability: 07/2026
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Reviews about this item

Review Summary

2026-04-03T20:00:00

Rated 1 out of 5

Arrived defective and grainy display

Bought as a big fan of lg oled tvs, but disappointed heavily. There was a line at the middle like thickness of 2-3 pixel and length of maybe 1000 pixels, from left to right. I tried the monitor like half an hour. It does automatically pixel refresh when you first boot it up. Greybanding was terrible. There were banding all over vertically and horizontally. Also the display itself was very grainy. There was a rough texture/graininess could be seen in both bright and dark scenes. It felt like watching the screen through a dirty window. Since the product was defective, I returned it.

Enesk

2026-03-30T20:00:00

Rated 1 out of 5

Defective / Broken

Very solid monitor until it wasn't. This product crashed mid gaming session after about 30 days of use and could not turn on anymore. Critical failure and product issue. Avid LG monitor supporter through the years but I would stay avoid this one unfortunately

TexasATX

2026-02-18T19:00:00

Rated 2 out of 5

Worse matte coating, no pixel shift pattern on OSD

The matte coating is worse than previous matte 3rd gen 480 hz woled, can't unsee it. Gamma feels weird, usually i like the gamma 1 setting for brighter feel but on this one it feels dark like gamma 2.2, black stabilizer is worse too so its hard to see in dark games (arc raiders) it was fine on 3rd gen woled.... There is no longer a pixel shift setting on the OSD anymore too so can't change the pixel shift pattern, why?

Lothar

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LG 27GX790B-B Specifications

Display

Display

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  • Screen Size

    26.5" (67.31cm)

  • Color Depth (Number of Colors)

    1.07B

  • Aspect Ratio

    16:9

  • Brightness (Typical, Minimum)

    Typical: 335 cd/sq. m
    Minimum: 300 cd/sq. m

  • Color Gamut (Typ.)

    DCI-P3 99.5% (CIE1976)

  • Contrast Ratio

    1500000:1

  • Display Type

    OLED

  • Pixel Pitch

    0.2292 x 0.2292mm

  • Refresh Rate

    540Hz

  • Resolution

    2560 x 1440

  • Response Time (GTG)

    0.02ms (GtG)

  • Viewing Angle

    178 Degree (R/L), 178 Degree (U/D)

Features

Jump to...
  • RGB LED Lighting

    Unity Hexagon Lighting

  • AMD FreeSync Premium Pro

    Yes

  • NVIDIA G-Sync Compatible

    Yes

  • DTS Headphone:X

    Yes

  • VESA Adaptive Sync

    Yes

  • Headphone 4-Pole (Sound+Mic)

    Yes

  • VRR

    Yes

  • LG Switch

    Yes

  • Auto Input Switch

    Yes

  • Black Stabilizer

    Yes

  • Color Weakness Mode

    Yes

  • Crosshair

    Yes

  • Dual Controller

    Yes

  • Dynamic Action Sync

    Yes

  • Factory Calibration

    Yes

  • FPS Counter

    Yes

  • H/W Calibration (True Color Pro)

    Yes

  • HDR Effect

    Yes

  • HDR10

    Yes

  • Live Color Low Blue Light

    Yes

  • Reader Mode

    Yes

  • Smart Energy Saving

    Yes

  • User Define Key

    Yes

  • VESA DisplayHDR

    DisplayHDR True Black 500

Input/Output

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  • USB Down-stream

    Yes (2ea/ver3.0)

  • DisplayPort

    Yes, 1x

  • USB Up-stream

    Yes (via USB-C)

  • USB Type-C

    Yes, 1x

  • HDMI

    Yes x 2x

  • HDMI Version 2.1

    Yes

  • DP Version

    2.1

  • Headphone Out

    Yes

  • USB-C (Data Transmission)

    Yes

Mechanical

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  • Display Position Adjustments

    Tilt/Height/Swivel/Pivot

  • Wall Mount Size

    100 x 100mm

  • DC Off (Max)

    Less than 0.5W

  • Input

    100-240V (50/60Hz)

  • Power Save/Sleep Mode (Max)

    Less than 0.5W

  • Type

    External Power(Adapter)

Physical

Jump to...
  • Color

    Black

  • Dimensions (W x H x D) With Stand

    With Stand: 23.8 x 15.7-20.8 x 8.7" (604.5 x 398.78-528.32 x 220.98mm)
    Without Stand: 23.8 x 13.8 x 2" (604.52 x 350.52 x 50.8mm)

  • Weight

    With Stand: 15 lbs (6.8kg)
    Without Stand: 9.5 lbs (4.3kg)

  • UPC Code

    195174137055

About LG 27GX790B-B

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

Perfect Black
UL-verified Perfect Black delivers true black levels to enhance perceived brightness and contrast, whether it's bright or dark around you. Perfect Color and 100% Color Fidelity- UL verified to deliver accurate color expression even under varying lighting conditions, from low light to bright ambient environments. 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.

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-certified-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.

ClearMR 21000 Delivers Elite Motion Clarity
Certified at ClearMR 21000-VESA's highest motion-clarity tier-this display eliminates the faint blur that lingers around fast-moving objects. Every rapid turn, sprint, and effect stays crisp, helping you react faster and play with greater confidence.

Unlock Your Potential with Advanced Gaming Features
• Dynamic Action Sync reduces input lag for real-time response
• Black Stabilizer brightens dark scenes to see what's hidden
• FPS Counter shows your real-time frame rate
• Crosshair enhances precision for shooting accuracy

Personalize Your Display with Switch App
With the LG Switch app, easily optimize your monitor for gaming or everyday use. Adjust brightness, fine-tune image quality, apply settings with a hotkey, split the screen into 11 layouts, and launch video calls in a click.

4-Pole Jack & DTS HP:X: Gaming Audio Unleashed
Experience lifelike 3D audio with DTS Headphone, pushing out spatial sound to make you feel even more part of the game. The 4-pole headphone jack combines stereo audio and mic input, delivering crisp sound and clear game-play comms through a single connection.

Virtually Borderless and Adjustable to Gamer Specs
Dive into gameplay on the 4-side, virtually borderless 27" OLED screen. The slim-profile display has adjustable height, tilt, swivel and pivot controls that let you customize your view, while backlighting amps up your battle station, making every session a vibe.

Versatile Connectivity
Versatile connectivity hub: Dual HDMI, DisplayPort 2.1, and USB downstream (x2) and USB upstream ensure seamless connections to all your devices, from consoles and peripherals to productivity gear.

LG 27GX790B-B Features

  • Experience UltraGear's brightest and fastest OLED on a 27" QHD display
  • Dual Mode refresh rate: switch between QHD at 540Hz or 720Hz HD speed
  • 0.02ms (GtG) response time renders fast action with almost zero blur or ghosting
  • DisplayPort 2.1 delivers massive bandwidth for sharper visuals and ultra-fast gameplay
  • DisplayHDR True Black 500 delivers deep blacks, rich contrast, and stunning dark-scene detail
  • Reduced screen stutter with NVIDIA G-SYNC compatibility AMD FreeSync Premium Pro
  • Virtually borderless 27" OLED with adjustable screen and back lighting for a custom setup

Key Features

  • Experience incredibly fluid gameplay with a 540Hz refresh rate and 0.02ms response time on this OLED gaming monitor.
  • Immerse yourself in stunning visuals with WQHD resolution and vibrant DCI-P3 99.5% color gamut for lifelike graphics.
  • Enjoy tear-free gaming thanks to AMD FreeSync Premium Pro and NVIDIA G-Sync compatibility, ensuring smooth performance.
  • Connect all your devices effortlessly with versatile HDMI 2.1, DisplayPort 2.1, and USB-C inputs.
  • Optimize your viewing comfort with tilt, height, swivel, and pivot adjustments for the perfect ergonomic setup.
  • Dive into rich, detailed sound with DTS Headphone:X, enhancing your audio experience for every game.

What's in the box:

  • LG UltraGear 27GX790B-B 26.5" 16:9 Dual Mode WQHD 540Hz and HD 720Hz OLED HDR Gaming Monitor
  • Stand
  • Display Port Cable
  • HDMI Cable
  • LG 2 Year Limited Warranty