LG UltraGear 27" QHD 540Hz WOLED Gaming Monitor (27GX790B)
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Key specs
- Display diagonal68.6 cm (27")
- Display resolution2560 x 1440 pixels
- Panel typeWOLED
- Response time0.02 ms
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Overview
- 27-inch QHD (2560x1440) WOLED 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
- Gamer adjustable display: Tilt/Height/Swivel/Pivot
Next-Level Visuals with 4th Gen WOLED Display – Dive into ultra-sharp detail on this 27" QHD (2560x1440) 4th Gen Tandem OLED gaming monitor. Expect deeper blacks, fast response, and jaw-dropping clarity that redefines your play.
LG’s Brightest* Gaming Monitor OLED Yet – Powered by the revolutionary 4th Gen WOLED with Primary RGB Tandem technology, reaching up to 1500 nits of peak brightness and certified with VESA DisplayHDR True Black 500 for crystal-clear, high-contrast gameplay, even in bright environments.
OLED with QHD 540Hz - HD 720Hz Dual-Mode - With VESA Certified Dual-Mode, enjoy UltraGear’s fastest performance with up to 720Hz—the highest refresh rate ever introduced. Seamlessly switch between QHD 540Hz for detailed visuals and HD 720Hz for ultra-fast action.
High-speed bandwidth with DisplayPort 2.1 - The latest DisplayPort 2.1 on the 27GX790B delivers next-generation bandwidth optimized for ultra-high-speed gaming, supporting stable performance even at extreme refresh rates. Extending this connectivity, the USB-C port supports streamlined single-cable display output and data transfer.
Certified with a widely adopted technology - NVIDIA G-SYNC Compatible / VESA Certified AdaptiveSync / AMD FreeSync Premium Pro that will provide tear-free ultra-smooth visuals and low latency
ClearMR 21000 for smooth motion, infinite play - VESA certified by ClearMR 21000, this monitor finally captures even the subtle blurring that occurs around the edges of moving objects, displaying fast-moving action with sharpness and detail.
Specifications
Display
| Display diagonal | 68.6 cm (27") |
|---|---|
| Display resolution | 2560 x 1440 pixels |
| Native aspect ratio | 16:9 |
| Display technology | OLED |
| Touchscreen | No |
| HD type | Quad HD |
| Panel type | WOLED |
| Display brightness (peak) | 1500 cd/m² |
| Display brightness (typical) | 335 cd/m² |
| Response time | 0.02 ms |
| Response time measurement type | GTG (Gray to Gray) |
| Display surface | Matt |
| Anti-glare screen | Yes |
| Screen shape | Flat |
| Supported graphics resolutions | 2560 x 1440, 1280 x 720 (HD 720) |
| Contrast ratio (typical) | 1500000:1 |
| Maximum refresh rate | 540 Hz |
| Refresh rate optimizor | Yes |
| Viewing angle, horizontal | 178° |
| Viewing angle, vertical | 178° |
| Display number of colours | 1.07 billion colours |
| Pixel pitch | 0.2292 x 0.2292 mm |
| Pixel density | 111 ppi |
| Horizontal scan range | 31.5 - 957.8 kHz |
| Vertical scan range | 60 - 720.3 Hz |
| High Dynamic Range (HDR) supported | Yes |
| High Dynamic Range (HDR) technology | HDR True Black 500, HDR Effect, High Dynamic Range 10 (HDR10) |
| Colour gamut standard | DCI-P3 |
| Colour gamut | 99.55% |
| DCI-P3 coverage | 99.5% |
Performance
| NVIDIA G-SYNC | Yes |
|---|---|
| AMD FreeSync | Yes |
| NVIDIA G-SYNC type | G-SYNC Compatible |
| AMD FreeSync type | FreeSync Premium Pro |
| VESA Adaptive Sync support | Yes |
| Flicker-free technology | Yes |
| Low Blue Light technology | Yes |
| Game mode | Yes |
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Multimedia
| Built-in speaker(s) | No |
|---|---|
| Built-in camera | No |
Design
| Market positioning | Gaming |
|---|---|
| Product colour | Black |
Ports & interfaces
| Built-in USB hub | Yes |
|---|---|
| Number of upstream ports | 1 |
| Number of downstream ports | 2 |
| Number of USB Type-C upstream ports quantity | 1 |
| USB Type-A downstream ports quantity | 2 |
| USB Type-C downstream ports quantity | 1 |
| USB Type-C DisplayPort Alternate Mode | Yes |
| USB Power Delivery (USB PD) | Yes |
| HDMI | Yes |
| HDMI ports quantity | 2 |
| HDMI version | 2.1 |
| DisplayPorts quantity | 1 |
| DisplayPort out quantity | 1 |
| DisplayPort version | 2.1 |
| Audio output | Yes |
| Headphone out | Yes |
| Headphone outputs | 1 |
| Headphone connectivity | 3.5 mm |
| Microphone in | Yes |
| HDCP | Yes |
| HDCP version | 2.3 |
Ergonomics
| VESA mounting | Yes |
|---|---|
| Panel mounting interface | 100 x 100 mm |
| Height adjustment | Yes |
| Pivot | Yes |
| Swivelling | Yes |
| Tilt adjustment | Yes |
| On Screen Display (OSD) | Yes |
Power
| Energy efficiency class (SDR) | F |
|---|---|
| Energy efficiency class (HDR) | G |
| Energy consumption (SDR) per 1000 hours | 25 kWh |
| Energy consumption (HDR) per 1000 hours | 29 kWh |
| Power consumption (typical) | 25 W |
| Power consumption (standby) | 0.5 W |
| Power consumption (max) | 46.32 W |
| Power consumption (off) | 0.3 W |
| AC input voltage | 100 - 240 V |
| AC input frequency | 50/60 Hz |
| Power supply type | External |
| Energy efficiency scale | A to G |
Weight & dimensions
| Width (with stand) | 605.2 mm |
|---|---|
| Depth (with stand) | 220 mm |
| Height (with stand) | 257.6 mm |
| Weight (with stand) | 6.8 kg |
| Width (without stand) | 605.2 mm |
| Depth (without stand) | 51.2 mm |
| Height (without stand) | 351 mm |
| Weight (without stand) | 4.3 kg |
Packaging content
| Stand included | Yes |
|---|---|
| Cables included | DisplayPort, HDMI |
| Power adapter included | Yes |
| Quick start guide | Yes |
| DisplayPort cable length | 1.5 m |
| HDMI cable length | 1.5 m |
Other features
| Country of origin | China |
|---|---|
| Brand specific technologies | Black Stabiliser, Crosshair, DAS Mode, Dual Mode |
| Low input lag | Yes |
| FPS counter | Yes |
| Hardware calibration | Yes |
| Compliance certificates | UL |
| Warranty period | 2 year(s) |
Manuals & downloads
Customer reviews
Delivery & returns
Delivery
- FREE standard delivery on orders over £50, otherwise £4.95 (3–5 working days).
- Express delivery £9.99 (1–3 working days) on selected products, UK mainland.
- PlayStation and Arozzi products use a 5–7 working-day service.
- Orders are processed within 24 hours, Monday to Friday excluding bank holidays. All deliveries must be signed for.
Returns
- Changed your mind? Tell us within 14 days of receiving your item, then return it within a further 14 days, unused and in its original packaging. A minimum £9.99 collection fee applies.
- Faulty or damaged on arrival? Contact us within 48 hours of delivery.
- Custom-built PCs can only be returned if faulty. Opened headphones, earphones and AirPods can't be returned for hygiene reasons.
