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LG UltraGear 27-inch 4th Gen. OLED QHD Gaming Monitorㅣ27GX790B with Dual Mode (720Hz@HD, 540Hz@QHD), 0.02ms(GtG)
Model # 27GX790B-B
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SKU: 27GX790B-B
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$1,398.00
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27GX790B-B — LG UltraGear™ 27" QHD OLED 540Hz (Dual Mode)
27-inch 4th Gen Tandem OLED gaming monitor with QHD up to 540Hz or HD up to 720Hz Dual Mode, 0.03ms GtG, up to 1500 nits peak brightness, DisplayHDR™ True Black 500, DP 2.1 DSC, HDMI 2.1, USB-C (DP Alt), hardware-calibration ready, and OLED Care tools for esports-grade clarity.
Highlights
- 4th Gen Primary RGB Tandem OLED with up to 1500 nits peak brightness and True Black 500.
- QHD 540Hz or HD 720Hz Dual Mode, 0.03ms GtG, ClearMR 21000, and OLED Care tools.
- DP 2.1 (DSC), dual HDMI 2.1, USB-C DP Alt, hardware calibration, and KVM-ready workflow.
- AdaptiveSync: G-SYNC Compatible, FreeSync Premium Pro, VESA AdaptiveSync certified.
- LG Switch app, PBP/PIP, and ergonomic stand with slim, space-saving base.
Gallery & Assets
(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 |
Key Specs
Screen Size 26.5" (67.3 cm)
Resolution 2560 x 1440 (QHD)
Panel Type OLED (4th Gen Primary RGB Tandem)
Refresh Rate (Max.) 540Hz (QHD) / 720Hz (HD) Dual Mode
Response Time 0.02ms (GtG)
Aspect Ratio 16:9
Colour Gamut (Typ.) DCI-P3 99.5% (CIE1976)
Brightness (Typ.) 335 cd/m²
HDR Certification VESA DisplayHDR™ True Black 500
Stand Adjustments Tilt / Height / Swivel / Pivot
Full Specifications
Display
| Size | 26.5" (67.3 cm) |
| Aspect Ratio | 16:9 |
| Panel Type | OLED (4th Gen Primary RGB Tandem) |
| Resolution | 2560 x 1440 (QHD) |
| Pixel Pitch | 0.2292 x 0.2292 mm |
| Colour Depth | 10-bit (1.07 Billion Colours) |
| Refresh Rate (Max.) | 540Hz @ QHD | 720Hz @ HD (VESA Certified Dual Mode) |
| Response Time | 0.02ms (GtG) — Faster Mode (Game Adjust → Response Time → Faster Mode) |
| Brightness (Typ.) | 335 cd/m² |
| Brightness (Min.) | 300 cd/m² |
| Peak Brightness | Up to 1500 nits (HDR peak)* |
| Contrast Ratio (Typ.) | 1,500,000:1 |
| Contrast Ratio (Min.) | 1,200,000:1 |
| Colour Gamut (Typ.) | DCI-P3 99.5% (CIE1976) |
| Colour Gamut (Min.) | 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 + Mic) |
Features
| HDR | HDR10 & HDR Effect |
| VESA DisplayHDR™ | DisplayHDR™ True Black 500 |
| AMD FreeSync™ | FreeSync™ Premium Pro |
| NVIDIA G-SYNC™ | G-SYNC® Compatible |
| VESA AdaptiveSync™ | Yes (Certified) |
| VESA ClearMR | ClearMR 21000 (Certified) |
| VESA Dual Mode | Yes (VESA Certified) |
| VRR | Yes |
| VESA DSC Technology | 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 |
| Colour Calibrated (Factory) | Yes |
| HW Calibration | HW Calibration Ready |
| RGB LED Lighting | Unity Hexagon Lighting |
Sound
| DTS Headphone:X | Yes |
| Headphone Jack | 4-pole 3.5mm (Sound + Mic combined) |
Mechanical & Design
| Borderless Design | 4-Side Virtually Borderless |
| Tilt | -5° ~ +21° |
| Height Adjustment | 110 mm |
| Swivel | -30° ~ +30° |
| Pivot | Clockwise (90°) |
| OneClick Stand | Yes |
| VESA Wall Mount | 100 × 100 mm |
Dimensions & Weight
| With Stand (W × H × D) | 605.2 × 527.6 × 220 mm (Highest) | 605.2 × 397.6 × 220 mm (Lowest) |
| Without Stand (W × H × D) | 605.2 × 351.0 × 51.2 mm |
| Weight with Stand | 6.8 kg |
| Weight without Stand | 4.3 kg |
| Shipping Weight | 9.8 kg |
Power
| AC Input | 100–240V (50/60Hz) |
| DC Output | 19V, 5.0A |
| Power Type | External Power (Adapter) |
| Sleep Mode (Max.) | Less than 0.5W |
| DC Off Mode (Max.) | Less than 0.3W |
In the Box
| Power Adapter | Yes (included) |
| Power Cord | Yes (included) |
| DisplayPort Cable | Yes — DisplayPort 2.1 (included) |
| HDMI Cable | Yes — HDMI 2.1, Black, 1.8m (included) |
| Other Accessories | Cable Holder & Mouse Holder |
Software & App
| LG Switch | Yes — screen splitting (11 layouts), hotkey presets, Dual Mode toggle |
| Dual Controller | Yes |
Certifications & Standards
| VESA DisplayHDR™ | DisplayHDR™ True Black 500 |
| VESA AdaptiveSync™ | Yes (Certified) |
| VESA ClearMR | ClearMR 21000 |
| VESA Dual Mode | Yes (Certified) |
| UL Verified — Flicker-Free | Yes (A196009) |
| UL Verified — Discomfort Glare Free | Yes (V563481, UGR < 22) |
| UL Verified — Low Blue Light (HW Platinum) | Yes (V745051) |
| UL Verified — Eyesafe 3.0 CPF60 | Yes (V745354) |
| UL Verified — 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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