OLED#5 in our OLED rankingsBest matte 540Hz alternative
LG UltraGear 27GX790B-B review
LG's 27-inch 1440p 540Hz tandem WOLED with a 720p 720Hz mode and a matte coating: the competitive OLED for rooms with glare.
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Quick verdict
The 27GX790B-B is the natural alternative to our competitive OLED pick for people whose desk faces a window or bright lights. It uses a 4th-generation tandem WOLED panel at 540Hz, like the ASUS PG27AQWP-W, but with a standard matte anti-glare coating instead of gloss, and adds a USB-C input.
The 720Hz mode runs at 1280×720, which Tom's Guide found very blurry, and its DisplayPort 2.1 input runs at UHBR13.5, so full specs need compression. LG's burn-in coverage is 2 years in the US according to its 2023 statement, shorter than the 3 years ASUS and Dell offer.
26.5″ · 1440p · 540Hz · dual mode 720p at 720Hz · WOLED (4th gen, Primary RGB Tandem)
Buy it if
- You want 540Hz OLED speed and your room has windows or lamps behind you.
- You want a USB-C video input.
- Your PC can hold very high frame rates.
Skip it if
- Your lighting is controlled; the glossy PG27AQWP-W shows deeper blacks and has a 3-year warranty.
- You rarely exceed 240 fps.
- You want a long burn-in warranty.
Key specifications
| Exact model | 27GX790B-B — not the older 480Hz 27GX790A-B |
|---|---|
| Size / aspect | 26.5″ / 16:9 |
| Resolution | 2560×1440 |
| Refresh rate | 540Hz |
| Dual mode | 1280×720 at 720Hz |
| Panel family | OLED |
| Panel subtype | WOLED (4th gen, Primary RGB Tandem) |
| Subpixel layout | Unknown (4th-gen WOLED) |
| Coating | Matte anti-glare |
| Curvature | Flat |
| Backlight | Not applicable (self-emissive) |
| Motion technology | Unknown |
| Adaptive sync / VRR | 48–540Hz (48–720Hz in HD mode); G-SYNC Compatible, FreeSync Premium Pro, HDMI 2.1 VRR |
| HDR | VESA DisplayHDR True Black 500 |
| DisplayPort | 1x DisplayPort 2.1 (UHBR13.5; DSC needed for the full spec) |
| HDMI | 2x HDMI 2.1 |
| USB-C | DisplayPort Alt Mode (power delivery not verified) |
| USB ports | 2x USB 3.0 downstream |
| KVM switch | Unknown |
| Audio | Headphone jack |
| Stand | 110mm height, tilt, pivot |
| VESA mount | 100 x 100 mm |
| Warranty | 2 years including burn-in (US), per LG's 2023 statement |
Specifications are manufacturer-stated unless marked as measured. “Unknown” means we could not verify the value, not that it is zero or absent.
Advantages and drawbacks
Advantages
- 540Hz at 1440p on a 4th-gen tandem WOLED panel.
- Matte coating handles reflections better than glossy rivals.
- USB-C with DisplayPort Alt Mode.
- DisplayHDR True Black 500 and bright HDR highlights.
Drawbacks
- 720Hz mode drops to 1280×720 and looks soft.
- DisplayPort 2.1 at UHBR13.5 still needs DSC for the full spec.
- 2-year US warranty, shorter than ASUS and Dell.
- Matte coating looks slightly grainier than glossy.
What independent testing reports
| Metric | Reported result | Conditions | Source |
|---|---|---|---|
| SDR brightness | 249 nits | Tom's Guide SDR measurement | Tom's Guide, April 30, 2026 |
| HDR brightness | 561 nits | 10% window | Tom's Guide, April 30, 2026 |
These are third-party results, not our tests. Different outlets use different methods, so compare numbers only within the same source.
Motion, response, and latency
At 540Hz each frame lasts about 1.9 ms on a sample-and-hold display, and OLED's near-instant response means there is almost no additional smear. As with every 540Hz monitor, you only see the full benefit when your game runs near 540 fps. The 720Hz mode trades resolution for speed at 1280×720. We did not find attributable input-lag measurements for this exact model.
Image quality and HDR
LG specifies about 335 nits typical SDR brightness and HDR peaks of 1,500 nits in a 1.5% window. Tom's Guide measured 249 nits in SDR and 561 nits at a 10% HDR window, with very wide color gamut coverage. The matte coating diffuses reflections, which helps in bright rooms but lifts blacks slightly compared with glossy tandem panels.
Connectivity, PC, and console notes
One DisplayPort 2.1 (UHBR13.5), two HDMI 2.1 ports, USB-C with DisplayPort Alt Mode, and two USB downstream ports. TFTCentral notes UHBR13.5 is not enough for the full spec without DSC.
OLED care and warranty
LG includes standard OLED care routines. Burn-in coverage is 2 years in the US according to LG's 2023 statement, for normal residential use; confirm the current terms with LG before buying.
Warranty: LG stated in 2023 that its US UltraGear OLED warranty of 2 years covers burn-in for normal residential PC use, excluding commercial use. This is an older statement; confirm current terms with LG. Source: TechRadar, August 11, 2023, checked September 30, 2026.
Alternatives worth comparing
ASUS ROG Swift OLED PG27AQWP-W
26.5″ · 1440p · 540Hz · dual mode 720p at 720Hz · WOLED (4th gen, Primary RGB Tandem)
Glossy version of the same class of panel with a 3-year burn-in warranty and UHBR20.
LG UltraGear 27GX790A-B
26.5″ · 1440p · 480Hz · WOLED
LG's earlier 480Hz model, often cheaper.
Questions buyers ask
Is the 720Hz mode 1080p?
No. TFTCentral notes LG's product page lists 1080p in one place, but the mode runs at 1280×720 (HD), which reviewers confirm.
Final recommendation
Choose the 27GX790B-B when you want 540Hz OLED speed and your room needs a matte screen. In a controlled room, the ASUS PG27AQWP-W remains our pick for its deeper blacks and longer warranty.
Sources
- LG UltraGear 27GX790B-B 540Hz (720Hz FHD) OLED — PC Monitors, December 13, 2025 (independent news)
- LG 27GX790B is Unleashed with 27" 540Hz 4th-Gen WOLED Panel and 720Hz Dual-Mode Support — TFTCentral, December 15, 2025 (independent news)
- LG UltraGear 27GX790B-B review — Tom's Guide, April 30, 2026 (independent testing)
- LG finally clarifies whether its warranty covers OLED burn-in on gaming monitors — TechRadar, August 11, 2023 (independent news)
- Amazon listing for this exact model (ASIN B0G5R2QK24), matched on September 30, 2026 by its listing title. We do not show Amazon prices or ratings.
First published . Last substantive update .