LG UltraGear OLED 27GX790A-B Review

Overview

The LG UltraGear OLED 27GX790A-B is a 27-inch 1440p W-OLED gaming monitor with a 480Hz refresh rate and one genuinely rare feature: a DisplayPort 2.1 UHBR20 input capable of 80 Gbps — enough bandwidth to run the panel's full 480Hz without display stream compression. Launched at $999.99, it has settled into a $650–800 street price that undercuts most of the 480–500Hz OLED class while carrying the most future-proof video input of any gaming monitor on the market.

The professional reception has been strong. PCMag awarded it 4/5 stars and an Editors' Choice designation, calling it "an esports gamer's delight"; Tom's Hardware scored it 4.5/5, noting it "ties my record for lowest input lag of any screen I've tested"; and T3 gave it a full 5 stars for refresh-focused buyers. The consensus: this is one of the fastest, best-measuring displays available, provided 1440p is enough resolution for you.

The interesting question the 27GX790A poses against rivals like the MSI MAG 272QP X50 is not "which is faster" — they are effectively tied — but "which panel philosophy do you prefer." LG's W-OLED uses a standard RGB subpixel layout, so text renders cleanly where QD-OLED fringes. It runs a matte coating that handles bright rooms better. It carries the DP 2.1 input QD-OLED rivals lack. Against that: its DisplayHDR True Black 400 certification sits a tier below the QD-OLED camp's True Black 500, and a small minority of owners report firmware quirks — refresh-rate instability and VRR flicker — along with one genuinely irritating behavior covered below.

Build Quality and Design

LG's UltraGear design language is mature and tidy: a matte black chassis with hexagonal rear vents, subtle red V-strip, and slim bezels on three sides. T3 praised the tool-free assembly — stand clicks into the panel, base clicks into the stand, operational in ten minutes from unboxing. The stand offers height, tilt, and swivel adjustment plus pivot, and the rear carries VESA 100x100 mounting points for monitor arms.

The OSD is LG's familiar joystick-driven UltraGear interface — logically organized with per-game custom slots, and reviewers find it among the better menu systems in the category. A small chin below the panel carries the indicator light; the overall build reads premium without the showboat flourishes of ASUS's ROG line.

The I/O array is where LG spends its budget: one DisplayPort 2.1 (UHBR20, 80 Gbps), two HDMI 2.1 ports, two USB-A downstream ports fed by a USB-B upstream, and a 3.5mm headphone jack. Notably absent: USB-C. T3 flagged it as a reasons-to-avoid item, and it is a real omission at this price — a single USB-C with 65W+ PD and video would have made this a dockable do-everything display. There are also no built-in speakers.

One design behavior deserves a warning that goes beyond ergonomics: plugging the monitor into a Windows PC over USB triggers an automatic installation of LG's OnScreen Control / "LG App Monitor" software — and multiple owners report it arrives alongside a McAfee-style prompt with no clear consent flow. One 1-star Amazon review is titled "Installs LG/McAfee bloatware on Windows computers" and describes exactly that experience. It is removable, but buyers should expect it and plan to uninstall.

Key Features

• 480Hz W-OLED panel — 27-inch 2560x1440 with 0.03ms GtG response, the fastest tier LG ships
• DisplayPort 2.1 UHBR20 (80 Gbps) — the only widely-available monitor input that can carry 1440p/480Hz uncompressed; no consumer GPU currently supports UHBR20, making this pure future-proofing that costs nothing today
• RGB subpixel layout (unlike QD-OLED's triangular layout) — clean text rendering with no green/pink fringing
• DisplayHDR True Black 400 certification with per-pixel OLED blacks and strong measured HDR output
• Wide DCI-P3 gamut coverage with factory calibration and an sRGB clamp mode
• NVIDIA G-Sync Compatible + AMD FreeSync Premium Pro — certified VRR across the panel's range
• Two HDMI 2.1 ports supporting 1440p/120 for PS5 and Xbox Series X
• Dual-port USB hub (2x USB-A) plus 3.5mm audio out
• LG UltraGear OSD with game modes, crosshair, Black Stabilizer, and per-input picture memory
• 3-year warranty including burn-in coverage

Performance

Speed is the headline and the record-setter. Tom's Hardware measured 10ms total input lag — tied for the lowest of any monitor its reviewer had tested — and 415 nits SDR / 763 nits HDR peak brightness, which the reviewer called "the highest I've seen from a 27-inch OLED screen" at the time. PCMag's measurements echoed the color story: strong gamut coverage with "compelling color range that just about anyone will enjoy." For esports titles — Valorant, Rainbow Six Siege, CS2 — the combination of 480Hz sampling, instantaneous pixel response, and record-class latency produces the most responsive image a consumer can currently buy.

Motion clarity matches the MSI X50's QD-OLED panel essentially frame for frame; both sit at the ceiling of what displays can currently demonstrate, and both leave LCDs visibly behind. W-OLED's motion rendering in dark scenes is marginally cleaner than first-gen QD-OLED, though the third-gen panels have closed most of that gap.

Brightness splits the verdict by use case. Tom's Hardware measured 415 nits SDR and a 763-nit HDR peak — at the time, the highest 27-inch OLED figures its reviewer had recorded — with two levels of variable brightness plus a constant-brightness mode for competitive consistency. Full-screen SDR output handles brighter rooms well thanks to the matte coating, and the panel carries DisplayHDR True Black 400 certification. QD-OLED rivals certified at the True Black 500 tier (including the MSI X50) claim a higher HDR tier on paper, though real-world measured differences are narrower than the badges suggest. Buyers prioritizing desktop and bright-room use will prefer this panel's matte finish and SDR strength; buyers chasing maximum specular pop in dark-room HDR will lean QD-OLED.

Text rendering is a genuine advantage. The RGB stripe subpixel layout renders Windows/macOS text cleanly — no fringing — which makes the 27GX790A the better choice among 480Hz OLEDs for people who work at the same desk they game on. QD-OLED owners wrestling with fringing often land on this panel as their preferred alternative, and the community thread consensus reflects that pattern.

The firmware asterisks. A 3-star Amazon review documents recurring refresh-rate instability: "the monitor has occasionally failed to stay at its advertised refresh rate... situations where the refresh rate changes or becomes unavailable, and I've also experienced the screen flickering or turning on and off," in a setup where other monitors behaved normally. LG firmware updates have addressed early units' worst of this, and most owners report flawless operation — the review sample skews toward the unlucky. VRR flicker at wildly fluctuating frame rates is a W-OLED trait here as it is on all OLEDs, mild in most units. Combined with the auto-installing Windows software, the pattern to internalize is: this panel measures beautifully, and the rough edges live in firmware and companion software rather than hardware.

Pros and Cons

Pros:

• Record-class input lag (10ms total, tied for lowest Tom's Hardware has measured) with 480Hz and 0.03ms response — the esports performance ceiling
• DisplayPort 2.1 UHBR20 (80 Gbps) — uncompressed 1440p/480Hz support and genuine next-gen GPU future-proofing no rival matches
• Clean RGB-subpixel text rendering — the 480Hz OLED to buy if the desk doubles as a workstation
• Matte coating plus higher full-screen SDR brightness than QD-OLED rivals; handles bright rooms better
• Strong measured color and editors' awards from PCMag (4/5, Editors' Choice), Tom's Hardware (4.5/5), and T3 (5/5)
• Dual HDMI 2.1 with solid console support; tool-free setup; mature, fast OSD

Cons:

• Plugging in over USB auto-installs LG's Windows companion app — reported by owners as disguised bloatware requiring manual removal
• HDR certification tier (True Black 400) sits below QD-OLED rivals' True Black 500 — less headline specular punch in cinematic HDR
• No USB-C at all, no KVM, and no speakers at a $999 list price
• A minority of owners report refresh-rate instability and flicker episodes; firmware updates help but the reports persist
• VRR flicker at fluctuating frame rates, inherent to the panel class
• 480Hz is beyond what current GPUs sustain in most titles — the spec is headroom, not a daily frame rate

Who Should Buy This

Buy it if: the desk hosts both work and play — the clean text rendering, matte finish, and higher SDR brightness make it the 480Hz OLED that doubles best as a daily monitor. Buyers planning to keep the display through one or two GPU generations get real value from the DP 2.1 UHBR20 input. Esports players who also value console compatibility will find the dual HDMI 2.1 ports convenient.

Skip it if: cinematic HDR impact is the top priority — QD-OLED's brighter highlights are the better fit, and the MSI X50 reviewed alongside this one is the value pick in that camp. USB-C-centric laptop users should look elsewhere entirely. And anyone allergic to vendor software behavior should factor in the auto-installing companion app before clicking buy.

Alternatives to Consider

• MSI MAG 272QP QD-OLED X50 (~$600–750) — 500Hz QD-OLED, ~1,000-nit HDR peaks, same 3-year burn-in warranty, $50–100 cheaper; the trade is text fringing, a glossy-ish coating, and DP 1.4a instead of 2.1. See the full GamepadSquire review
• ASUS ROG Swift PG27AQDP (~$800–900) — the 480Hz W-OLED category's premium implementation with richer OSD tooling and better factory QC consistency, at a higher price
• LG UltraGear 27GX704A-B (~$450–550) — LG's own 240Hz 1440p W-OLED; if 480Hz is not a hard requirement, this delivers 90% of the experience for two-thirds the money
• AOC Q27G3XMN (~$280) — the budget mini-LED route to real HDR; massively less motion clarity, massively more money left in pocket

Verdict

The 27GX790A-B is the thinking buyer's 480Hz OLED: it takes the category's ceiling-tier speed and latency, then adds the two things rivals skip — a clean text-rendering subpixel layout and a DisplayPort 2.1 input that will still be current when the next GPU generation lands. The lower HDR certification tier and the USB auto-install behavior are unwelcome guests, but neither touches the core competence. At its prevailing $650–750 street price against a $999 list, it is frequently the best value in top-tier esports displays, and the Editors' Choice badges from three major outlets are consistent with what the measurements say. 8.9/10.