LG 27GX790A-B 27" 480Hz OLED Ultragear Gaming Monitor

Name: LG 27GX790A-B 27" 480Hz OLED Ultragear Gaming Monitor
Brand: LG
SKU: 27GX790A-B.AUS

★★★★★5.0 (2 reviews)

QHDUSB 3.0DisplayPortHDMI 2.1HDR

A 480Hz OLED panel with 0.03ms response time and DisplayPort 2.1 — the LG 27GX790A-B is the current ceiling for competitive gaming monitor performance.

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Overview

The LG 27GX790A-B sits at the current performance apex for gaming monitors: a 27-inch QHD OLED panel capable of 480Hz refresh with a measured 0.03ms grey-to-grey response time. What those numbers mean in practice is the effective elimination of the two main visual artifacts that degrade competitive gaming — motion blur from slow pixel transitions and screen tearing from frame-rate/refresh-rate mismatch. The OLED substrate delivers this at native pixel-level black, meaning the 1.5M:1 contrast ratio isn't a marketing abstraction derived from local dimming zones; each pixel shuts off independently. Paired with 98.5% DCI-P3 coverage, the result is HDR content that actually looks like HDR, not a backlit LCD panel brightening regions of the screen. DisplayPort 2.1 is the bandwidth infrastructure that makes 480Hz at 2560x1440 possible — and critically, the monitor includes the port rather than requiring the refresh rate target via HDMI 2.1, which cannot carry the required data rate at this resolution.

The ergonomic stand covers the full adjustment range — height, tilt, swivel, and pivot — which matters for a monitor you'll spend multi-hour sessions in front of. The anti-glare OLED surface handles ambient light better than older OLED coatings, reducing the mirror-like reflections that made earlier OLED monitors difficult in bright rooms. Connectivity extends to two HDMI 2.1 ports for console gaming at high refresh rates and USB 3.0 hub functionality (one upstream, three downstream). The 4-pole 3.5mm headphone jack combining audio and mic in a single connection is a thoughtful inclusion for headset users who want to minimize cable routing. LG's OLED Care tools — automated pixel cleaning, brightness management — address the burn-in concern that's been the historic barrier to OLED adoption in monitor form factors. The 2-year panel warranty backs up that engineering with real coverage.

Key Features

27” OLED Brilliance with up to 480Hz of Game-Changing Speed - Experience ultra-smooth, tear-free gameplay with up to 480Hz refresh rate and 0.03ms response time on a bright 27” QHD OLED display. React instantly, spot every detail, and outpace your opponents in every frame with unbeatable speed and clarity.

Unleash Next-Gen Speed with Future-Ready DisplayPort 2.1 - DisplayPort 2.1 delivers ultra-fast data speeds for flawless 480Hz gameplay. Enjoy sharper visuals with higher resolution support, virtually zero lag, and instant responsiveness, giving you the edge to dominate.The monitor also has two HDMI 2.1 ports and USB 3.0 connectivity (1 upstream / 3 downstream)

Bright Picture. Deep Blacks, Brilliant Detail: OLED Gaming FTW - Get lost in vivid visuals with OLED technology, delivering exceptional brightness, up to 98.5% of DCI-P3 color coverage, a 1.5M:1 contrast ratio, and DisplayHDR True Black 400. Every gaming scene pops with deep blacks, brilliant highlights, and cinematic color.

Ultimate Frame Sync: FreeSync Premium Pro & G-SYNC Compatible - Say goodbye to screen tearing and stutter. With AMD FreeSync Premium Pro and NVIDIA G-SYNC compatibility, this OLED monitor delivers ultra-smooth, tear-free visuals, giving you perfect frame sync across PC and next-gen console gaming.

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

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 deadly accuracy.

4-Pole Jack & DTS HP:X: Gaming Audio Unleashed - Experience lifelike 3D audio with DTS Headphone2, 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.

Up to 98.5% DCI-P3 Color Coverage - With up to 98.5% DCI-P3 color spectrum coverage, the OLED display brings HDR games to life, delivering vibrant, colors for stunning visual realism in every frame.

Low Glare, More Focus: Play Without Distractions - Stay in the zone with an OLED screen that’s designed to minimize glare and reflections. The anti-glare surface reduces light distractions, so you can keep your attention where it matters—on every move, every target, and every win.

OLED Protection: 2-Year Limited Warranty & Panel - Rest easy knowing your OLED monitor is built to last. The 2-year limited warranty covers key components, including the OLED panel. And OLED Care tools such as pixel cleaning keep your display sharp, for reliable top-tier performance. Please see Warranty Information on this page for all warranty details.Care Tools -

Specifications

Screen Size

27 inches

Display Technology

OLED

Resolution

QHD

Refresh Rate

Up to 480Hz

Response Time

0.03ms

Color Coverage

Up to 98.5% DCI-P3

Contrast Ratio

1.5M:1

HDR Support

DisplayHDR True Black 400

Ports

DisplayPort 2.1

Ports

2x HDMI 2.1

USB Connectivity

1 upstream / 3 downstream USB 3.0

Sync Technology

AMD FreeSync Premium Pro

Sync Technology

NVIDIA G-SYNC Compatible

Adjustability

Height, tilt, swivel, pivot

Backlighting

RGB hexagonal

Audio Output

4-pole headphone jack

Audio Technology

DTS Headphone:X

Warranty

2-Year Limited Warranty (includes OLED panel)

Pros & Cons

👍 Pros

480Hz refresh rate combined with 0.03ms response time eliminates perceptible motion blur and ghosting that remain visible on slower OLED and IPS panels
DisplayPort 2.1 provides the bandwidth ceiling necessary to actually hit 480Hz at QHD — the hardware connection matches the panel's capability
OLED panel delivers a 1.5M:1 native contrast ratio and true blacks that LCD backlighting cannot replicate, regardless of local dimming technology
98.5% DCI-P3 coverage makes this a credible display for HDR content consumption and color-sensitive creative work alongside gaming
FreeSync Premium Pro and G-Sync Compatible dual certification means it works cleanly with both major GPU ecosystems without tearing or stutter

👎 Cons

Reaching 480Hz demands a DP 2.1-equipped GPU from the current generation — older cards are bottlenecked well below the panel's ceiling
OLED burn-in risk requires active management via LG's care tools, particularly for users who leave static UI elements on screen during long sessions
QHD at 27" yields ~108 PPI — sharp, but users coming from 4K panels at the same size will notice the resolution step-down
The 480Hz capability requires a GPU capable of consistently producing 400+ FPS in target games — for GPU-limited systems, the performance ceiling is theoretical rather than practical
RGB hexagonal backlighting adds visual ambiance but increases desk power draw and is irrelevant to display performance

Frequently Asked Questions

What does 480Hz actually do for gameplay versus a 240Hz or 360Hz monitor?

At 480Hz, the display renders a new frame every ~2.08ms, versus ~2.78ms at 360Hz or ~4.17ms at 240Hz. The practical effect is measurably smoother motion rendering and reduced motion blur on fast-moving objects — most visible in high-framerate competitive titles like CS2, Valorant, or fast-paced shooters where tracking moving targets is the limiting factor. The gains are real but incremental beyond 240Hz; the full benefit requires a GPU capable of sustaining 400+ FPS in your target game.

Does hitting 480Hz require DisplayPort 2.1, and what GPU is needed?

Yes — 480Hz at QHD (2560x1440) requires DisplayPort 2.1 bandwidth. The HDMI 2.1 ports top out at lower refresh rates for this resolution. On the GPU side, you need a current-generation NVIDIA (RTX 40-series or newer) or AMD (RX 7000-series or newer) card with a DP 2.1 output to unlock the full 480Hz ceiling.

How does OLED burn-in risk apply to this monitor in daily gaming use?

LG includes OLED Care tools — pixel cleaning and screen protection features — to mitigate long-term burn-in risk. Displaying static UI elements (HUD overlays, taskbars) for extended hours is the primary risk scenario. The 2-year warranty covers the OLED panel specifically, which gives meaningful protection. For mixed-use workstations with long static-content sessions, an IPS panel would carry less burn-in risk.

Is this monitor G-Sync Compatible or fully certified G-Sync Ultimate?

It's NVIDIA G-Sync Compatible (validated variable refresh rate) and AMD FreeSync Premium Pro certified. It is not G-Sync Ultimate, which means it lacks the dedicated G-Sync module. In practice, VRR performance is excellent and indistinguishable from G-Sync Ultimate for the majority of gaming scenarios.

What's the color accuracy out of the box for creative work alongside gaming?

With up to 98.5% DCI-P3 coverage and a 1.5M:1 native OLED contrast ratio, the display is genuinely capable for color-sensitive work. However, factory calibration varies by unit — for professional color grading or print-accurate work, hardware calibration is recommended to verify delta-E performance.