LG UltraGear 27GX790B-B 27" QHD 540Hz / HD 720Hz 0.02ms OLED Dual-Mode Gaming Monitor - 27GX790B-B
Model # 27GX790B-B
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SKU: 27GX790B-B
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LG UltraGear 27GX790B-B 27-inch QHD OLED Gaming Monitor
The LG UltraGear 27GX790B-B combines a 4th Gen Primary RGB Tandem OLED panel with QHD resolution, up to 540Hz refresh at QHD or 720Hz in HD Dual Mode, and a 0.02ms GtG response time. High-speed connectivity, adaptive-sync technologies and OLED image quality make it designed for fast competitive gaming.
4th Gen OLED Display
The 26.5-inch viewable display uses 4th Gen Primary RGB Tandem OLED technology with a 2560 × 1440 QHD resolution, up to 1500 nits HDR peak brightness, a 1,500,000:1 typical contrast ratio and DCI-P3 99.5% typical colour coverage.
QHD 540Hz Performance
Run the display at up to 540Hz at its native QHD resolution for high-refresh competitive gaming with detailed 2560 × 1440 visuals.
720Hz HD Dual Mode
VESA Certified Dual Mode allows the display to operate at up to 720Hz in HD mode when maximum refresh rate is preferred.
0.02ms GtG Response
The OLED panel supports a 0.02ms GtG response time in Faster Mode and carries VESA ClearMR 21000 certification.
True Black HDR
VESA DisplayHDR™ True Black 500 combines with OLED contrast and wide DCI-P3 colour coverage for detailed highlights and deep black levels.
Adaptive Gaming Technologies
The 27GX790B-B supports NVIDIA G-SYNC Compatible, AMD FreeSync Premium Pro and VESA Certified AdaptiveSync technologies for variable refresh rate gaming.
Dynamic Action Sync
Dynamic Action Sync is included alongside additional gaming functions such as Black Stabiliser, Crosshair and FPS Counter.
OLED Gaming Clarity
The combination of a high refresh rate, rapid OLED response and ClearMR 21000 certification is designed around fast-moving gaming content.
High-Speed Connectivity
DisplayPort 2.1 with DSC, two HDMI 2.1 inputs and USB-C with DisplayPort Alt Mode provide flexible connection options for a modern gaming setup.
DisplayPort 2.1 and HDMI 2.1
The monitor includes one DisplayPort 2.1 connection with DSC and two HDMI 2.1 inputs.
USB-C and USB Hub
USB-C supports DisplayPort Alt Mode, while two USB 3.0 downstream ports provide additional peripheral connectivity.
LG Switch
LG Switch supports screen splitting with 11 layouts, hotkey presets and Dual Mode switching for convenient control of supported display functions.
Ergonomic Gaming Setup
Adjustable Stand
The supplied stand supports tilt from -5° to +21°, 110mm height adjustment, -30° to +30° swivel and 90° clockwise pivot.
VESA Mounting
A 100 × 100mm VESA mounting interface provides an alternative to the included OneClick stand.
DTS Headphone:X
DTS Headphone:X is supported through the monitor's four-pole 3.5mm connection for sound and microphone connectivity.
Hardware Calibration Ready
The display is factory colour calibrated and supports hardware calibration when used with suitable calibration equipment.
Why Choose the LG UltraGear 27GX790B-B?
The 27GX790B-B brings together a QHD 4th Gen OLED display, up to 540Hz QHD and 720Hz HD Dual Mode refresh rates, a 0.02ms GtG response time, adaptive-sync support and DisplayPort 2.1 connectivity in a 27-inch gaming monitor.
Frequently Asked Questions
What resolution does the LG 27GX790B-B support?
The native resolution is 2560 × 1440 QHD.
What is the maximum refresh rate?
The monitor supports up to 540Hz at QHD resolution and up to 720Hz in HD Dual Mode.
What is the response time?
The supplied specification lists a 0.02ms GtG response time in Faster Mode.
Does the LG 27GX790B-B support G-SYNC and FreeSync?
Yes. It supports NVIDIA G-SYNC Compatible, AMD FreeSync Premium Pro and VESA Certified AdaptiveSync.
What connections are available?
The monitor includes DisplayPort 2.1 with DSC, two HDMI 2.1 inputs, USB-C with DisplayPort Alt Mode, two USB 3.0 downstream ports and a four-pole 3.5mm headphone connection.
Can the monitor be VESA mounted?
Yes. The LG 27GX790B-B supports a 100 × 100mm VESA mount.
(27GX790B-B)
Key Features
| Display – Size [Inch] | 27 |
| Display – Resolution | 2560 × 1440 (QHD) |
| Display – Panel Type | 4th Gen Tandem OLED |
| Display – Refresh Rate (Max.) | 540 Hz (QHD) / 720 Hz (HD Dual Mode) |
| Display – Response Time | 0.03 ms (GtG) |
| Display – Brightness (Peak) | Up to 1500 nits |
| Display – Colour Gamut (Typ.) | DCI-P3 98% |
| Display – HDR | DisplayHDR™ True Black 500 |
| Sync / Certification | G-SYNC Compatible, FreeSync Premium Pro, VESA AdaptiveSync |
| Ports (Main) | DP 2.1 (DSC) ×1, HDMI 2.1 ×2, USB-C (DP Alt) ×1 |
LG UltraGear 27GX790B-B Key Specifications
Display
| Size | 26.5" (67.3 cm) |
| Aspect Ratio | 16:9 |
| Panel Type | OLED (4th Gen Primary RGB Tandem) |
| Resolution | 2560 × 1440 QHD |
| Pixel Pitch | 0.2292 × 0.2292 mm |
| Colour Depth | 10-bit, 1.07 Billion Colours |
| Refresh Rate | 540Hz @ QHD / 720Hz @ HD, VESA Certified Dual Mode |
| Response Time | 0.02ms GtG, Faster Mode |
| Brightness, Typical | 335 cd/m² |
| Brightness, Minimum | 300 cd/m² |
| Peak Brightness | Up to 1500 nits, HDR peak |
| Contrast Ratio, Typical | 1,500,000:1 |
| Contrast Ratio, Minimum | 1,200,000:1 |
| Colour Gamut, Typical | DCI-P3 99.5% (CIE1976) |
| Colour Gamut, Minimum | DCI-P3 94.0% (CIE1976) |
| Viewing Angle | 178° R/L, 178° U/D, CR ≥ 10 |
| Surface Treatment | Anti-Glare, Low-Reflection AGLR front polarizer |
Connectivity
| DisplayPort | DisplayPort 2.1 × 1 with DSC |
| HDMI | HDMI 2.1 × 2 |
| USB Type-C | Yes × 1, DisplayPort Alt Mode, up to 2560 × 1440 @ 540Hz |
| USB Downstream | USB 3.0 × 2 |
| USB Upstream | Yes, via USB-C |
| Headphone Out | 4-pole 3.5mm, sound + microphone |
Gaming and Display Features
| HDR | HDR10 and HDR Effect |
| VESA DisplayHDR™ | DisplayHDR™ True Black 500 |
| AMD FreeSync™ | FreeSync™ Premium Pro |
| NVIDIA G-SYNC™ | G-SYNC Compatible |
| VESA AdaptiveSync™ | Certified |
| VESA ClearMR | ClearMR 21000 Certified |
| VESA Dual Mode | Certified |
| VRR | Yes |
| VESA DSC | Yes |
| Dynamic Action Sync | Yes |
| Black Stabiliser | Yes |
| Crosshair | Yes |
| FPS Counter | Yes |
| Reader Mode | Yes |
| Auto Input Switch | Yes |
| User Defined Key | Yes |
| Colour Weakness Mode | Yes |
| Smart Energy Saving | Yes |
| Factory Colour Calibration | Yes |
| Hardware Calibration | Hardware Calibration Ready |
| RGB Lighting | Unity Hexagon Lighting |
Sound
| DTS Headphone:X | Yes |
| Headphone Jack | 4-pole 3.5mm, sound + microphone combined |
Mechanical and Design
| Borderless Design | 4-Side Virtually Borderless |
| Tilt | -5° to +21° |
| Height Adjustment | 110mm |
| Swivel | -30° to +30° |
| Pivot | Clockwise 90° |
| OneClick Stand | Yes |
| VESA Wall Mount | 100 × 100mm |
Dimensions and Weight
| With Stand | 605.2 × 527.6 × 220mm highest / 605.2 × 397.6 × 220mm lowest |
| Without Stand | 605.2 × 351.0 × 51.2mm |
| Weight with Stand | 6.8kg |
| Weight without Stand | 4.3kg |
| Shipping Weight | 9.8kg |
Power
| AC Input | 100–240V, 50/60Hz |
| DC Output | 19V, 5.0A |
| Power Type | External power adapter |
| Sleep Mode | Less than 0.5W |
| DC Off Mode | Less than 0.3W |
In the Box
| Power Adapter | Included |
| Power Cord | Included |
| DisplayPort Cable | DisplayPort 2.1 cable included |
| HDMI Cable | HDMI 2.1, black, 1.8m included |
| Other Accessories | Cable Holder and Mouse Holder |
Software and App
| LG Switch | Screen splitting with 11 layouts, hotkey presets and Dual Mode toggle |
| Dual Controller | Yes |
Certifications and Standards
| VESA DisplayHDR™ | DisplayHDR™ True Black 500 |
| VESA AdaptiveSync™ | Certified |
| VESA ClearMR | ClearMR 21000 |
| VESA Dual Mode | Certified |
| UL Flicker-Free | Yes, A196009 |
| UL Discomfort Glare Free | Yes, V563481, UGR < 22 |
| UL Low Blue Light | Hardware Platinum, V745051 |
| UL Eyesafe 3.0 CPF60 | Yes, V745354 |
| UL Eyesafe 3.0 RPF40 | Yes, V275741 |
| AMD FreeSync™ | FreeSync™ Premium Pro |
| NVIDIA G-SYNC™ | G-SYNC Compatible |
| UL / cUL | Yes |
| CE | Yes |
| SKU | 27GX790B-B |
| Brand | LG |
| Shipping Weight | 9.0000kg |
Manufacturer Warranty
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