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27 inch black frameless OLED gaming monitor on adjustable stand with RGB lighting

LG Electronics

LG Electronics 27GX790A-B 27" 480Hz OLED QHD gaming monitor

SKU CH-TYV0-VY5DB MPN 27GX790A-B

A 27-inch OLED gaming monitor delivering 480Hz refresh rate, 0.03ms response time, and 1.5M:1 contrast for ultra-smooth, tear-free play

  • Screen size27 in (68.6 cm)
  • Display resolution2560 × 1440 (2K)
  • Refresh frequency480 Hz
  • Panel typeOLED
  • Pixel response time0.03 ms (GtG)
  • HDR formatHDR10

Refresh rate 540Hz

  • 480 Hz refresh rate delivers ultra-smooth motion for competitive gaming
  • 03 ms response time eliminates ghosting on fast-moving objects
  • OLED panel provides 1,500,000:1 contrast with deep blacks and bright highlights
  • 5% DCI-P3 coverage renders vivid, accurate colours across games and media
  • VESA ClearMR 21000 certification ensures sharp detail during rapid screen motion

27-inch 480 Hz OLED gaming monitor

The LG UltraGear 27GX790A-B is a 27-inch QHD OLED display built for competitive gaming. It delivers a 2560 x 1440 resolution with a 480 Hz refresh rate and a 0.03 ms grey-to-grey response time. Adaptive sync support covers FreeSync Premium Pro and G-Sync Compatible operation.

Sustained 480 Hz motion clarity with ClearMR 21000

The panel maintains its 480 Hz refresh rate under continuous load thanks to DisplayPort 2.1 bandwidth. VESA ClearMR 21000 certification confirms that fast-moving objects stay sharp without the faint blur seen on lower-tier panels. Typical brightness sits at 275 cd/m² with a minimum of 250 cd/m², while the 1,500,000:1 contrast ratio and 98.5 % DCI-P3 coverage remain stable during long sessions. DisplayHDR True Black 400 ensures deep blacks do not lift under heat.

Frameless design with adjustable stand and VESA

The virtually borderless cabinet allows multi-monitor alignment and the included stand provides height, tilt and pivot adjustment for ergonomic positioning. A 100 x 100 mm VESA pattern enables arm or wall mounting if desk space is limited. Connectivity includes one DisplayPort 2.1, two HDMI 2.1 ports and a USB 3.0 hub with one upstream and two downstream ports. The anti-glare low-reflection polariser reduces distractions in bright rooms.

How it compares

Measured against everything we stock in Monitors for Gamers, at today’s prices. Recalculated every night.

Price $705.99
Pricier than about 90% of the 839 comparable items (median $189.99).
Screen size 27 in (68.6 cm)
Typical for this category: the median of 814 items is 27 in.
Refresh frequency 480 Hz
Higher than about 93% of the 735 comparable items (median 180 Hz).

Specifications

Product
Brand nameLG
Product lineUltraGear
Model name27GX790A-B
Case colorBlack
Display
Screen size27 in (68.6 cm)
Display resolution2560 × 1440 (2K)
Refresh frequency480 Hz
Panel typeOLED
Pixel response time0.03 ms (GtG)
HDR formatHDR10
Image brightness275 cd/m2 (Typ.), 250 cd/m2 (Min.)
Screen curvatureFlat Panel
Bezel styleFrameless
Widescreen formatNo
Screen finishAnti-Glare, Low-Reflection of the front polarizer
Display formatQHD
Variable refresh rateFreeSync Premium & G-Sync Compatible
Viewing angles178° (H) / 178° (V)
Screen ratio16:9
Contrast1,500,000:1 (Typ.)
Colors displayed1.07 Billion
Pixel pitch0.2292 mm
DisplayHDR certificationDisplayHDR True Black 400
Ports & slots
HDMI ports2 x HDMI 2.1
DisplayPort connectors1 x DisplayPort 2.1
Video connectors1 x DisplayPort 2.1 / 2 x HDMI 2.1
USB connections1 x USB 3.0 Upstream / 2 x USB 3.0 Type-A Downstream
Headphone jack4-Pole (Sound+Mic)
Power
Power drawPower Save/Sleep Mode (Max): Less than 0.5 W
DC Off (Max): Less than 0.3 W
Power supplyType: External Power(Adapter)
Input: 100 to 240 V (50/60 Hz)
Size & build
Stand adjustabilityTilt (Angle): -5 to 15°
Swivel (Angle): -30 to 30°
Height Range (mm): 110 mm
Down Height (mm): 118.2 mm
Pivot (Angle): Clockwise
One Click Stand Set-up
Base Detachable
VESA mounting pattern100 × 100 mm
Product dimensions18.5 in-22.8 in × 23.8 in × 9.8 in with stand
13.8 in × 23.8 in × 1.8 in without stand
Product weight20.5 lb with stand
11.2 lb without stand
Shipping weight12.52 kg
Package size813 × 527 × 178 mm
In the box
In the boxPower Cord
Display Port Cable (ver 2.1)
HDMI Cable (ver 2.1)
Calibration Report (Paper)
USB A to B Cable

Other versions of this model

3 more in the same range

Questions about this item

Will my graphics card handle 480 Hz at 2560 x 1440?

You need a GPU with DisplayPort 2.1 or HDMI 2.1 output and enough render performance for 480 frames per second at QHD. Check your card’s spec sheet for those interface versions.

Does the stand allow height, tilt and swivel adjustment?

The monitor ships with an ergonomic stand that provides height, tilt and swivel movement so you can set the 27 inch screen at a comfortable viewing angle.

What does the ClearMR 21000 rating mean for fast motion?

ClearMR 21000 is VESA’s top motion-clarity tier; it certifies that fast-moving objects stay sharp with virtually no visible blur during rapid gameplay.

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