OLED#11 in our OLED rankingsBright 480Hz with DisplayPort 2.1
LG UltraGear 27GX790A-B review
LG's 27-inch 1440p 480Hz WOLED with DisplayPort 2.1 and high measured brightness, now often cheaper since the 540Hz model arrived.
As an Amazon Associate I earn from qualifying purchases. How affiliate links work here.
Quick verdict
The 27GX790A-B is a strong 480Hz OLED that Tom's Hardware named its pick for responsiveness, reporting record-low input lag and brightness above its competitors at the time (415 nits SDR and 763 nits HDR at a 25% window). It adds DisplayPort 2.1 and a fully adjustable stand.
Its successor, the 540Hz 27GX790B-B, is faster, so this model makes most sense when it is noticeably cheaper. LG's warranty is 2 years, shorter than ASUS and Dell.
26.5″ · 1440p · 480Hz · WOLED
Buy it if
- You play esports at 300+ fps.
- You want strong OLED brightness.
- It is priced below the newer 540Hz models.
Skip it if
- You want the longest warranty.
- You want USB-C.
Key specifications
| Exact model | 27GX790A-B — not the newer 540Hz 27GX790B-B |
|---|---|
| Size / aspect | 26.5″ / 16:9 |
| Resolution | 2560×1440 |
| Refresh rate | 480Hz |
| Dual mode | No |
| Panel family | OLED |
| Panel subtype | WOLED |
| Subpixel layout | Unknown |
| Coating | Anti-glare front layer |
| Curvature | Flat |
| Backlight | Not applicable (self-emissive) |
| Motion technology | Unknown |
| Adaptive sync / VRR | G-SYNC Compatible; FreeSync Premium Pro |
| HDR | VESA DisplayHDR True Black 400 |
| DisplayPort | 1x DisplayPort 2.1 |
| HDMI | 2x HDMI 2.1 |
| USB-C | None |
| USB ports | USB 3.0: 1 upstream, 2 downstream |
| KVM switch | No |
| Audio | Headphone jack with DTS Headphone:X; no speakers |
| Stand | Full ergonomic adjustment: tilt, height, swivel, pivot |
| VESA mount | Unknown |
| Warranty | 2 years (US); burn-in covered 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
- Record-low input lag in Tom's Hardware's testing.
- 415 nits SDR and 763 nits HDR at a 25% window.
- DisplayPort 2.1.
- Fully adjustable stand.
Drawbacks
- 2-year warranty.
- Needs calibration for accurate color, per Tom's Hardware.
- No speakers or USB-C.
What independent testing reports
| Metric | Reported result | Conditions | Source |
|---|---|---|---|
| SDR brightness | 415 nits | 25% window, variable brightness set to high | Tom's Hardware, July 25, 2025 |
| HDR brightness | 763 nits | 25% window | Tom's Hardware, July 25, 2025 |
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 480Hz each frame lasts about 2.1 ms on a sample-and-hold display. Tom's Hardware reported record-low input lag with perfect motion resolution. We did not find a documented black frame insertion mode.
Image quality and HDR
Tom's Hardware measured 415 nits in SDR and 763 nits in HDR at a 25% window, higher than competing OLEDs at the time of its test. Color needs calibration for best accuracy. WOLED holds deep blacks well in ambient light.
Connectivity, PC, and console notes
DisplayPort 2.1, two HDMI 2.1 ports, a two-port USB hub, and a headphone jack with DTS Headphone:X. No USB-C.
OLED care and warranty
LG includes pixel orbiting, a screen saver, and a refresh routine. The warranty is 2 years according to Tom's Hardware; LG's 2023 statement says US UltraGear OLED coverage includes burn-in for normal residential use.
Warranty: Tom's Hardware lists a 2-year warranty. LG stated in 2023 that its US UltraGear OLED warranty covers burn-in for normal residential use. Confirm current terms with LG. Source: TechRadar, August 11, 2023, checked September 30, 2026.
Alternatives worth comparing
ASUS ROG Swift OLED PG27AQDP
26.5″ · 1440p · 480Hz · WOLED (3rd gen, LG Display)
480Hz matte WOLED with a 3-year burn-in warranty.
LG UltraGear 27GX790B-B
26.5″ · 1440p · 540Hz · dual mode 720p at 720Hz · WOLED (4th gen, Primary RGB Tandem)
LG's 540Hz successor with USB-C.
Questions buyers ask
Should I buy the 27GX790A-B or 27GX790B-B?
The B model is faster (540Hz) and adds USB-C. The A model is worth it only at a clear discount.
Final recommendation
A bright, very responsive 480Hz OLED that is worth buying at a discount; otherwise step up to a 540Hz model or choose ASUS for a longer warranty.
Sources
- LG 27GX790A 480 Hz OLED review — Tom's Hardware, July 25, 2025 (independent testing)
- LG finally clarifies whether its warranty covers OLED burn-in on gaming monitors — TechRadar, August 11, 2023 (independent news)
- Best OLED Gaming Monitors 2026 — Tom's Hardware, August 27, 2026 (independent testing)
- Amazon listing for this exact model (ASIN B0DMPTN8DG), matched on September 30, 2026 by its listing title. We do not show Amazon prices or ratings.
First published . Last substantive update .