LG UltraGear 27GX790A-B / ASUS ROG Swift OLED PG27AQDM

LG UltraGear 27GX790A-B: 27-inch class (26.5-inch) QHD 480 Hz OLED

ASUS ROG Swift OLED PG27AQDM: PG27AQDM: a 26.5-inch (27-inch class) 1440p 240 Hz WOLED gaming monitor. The brighter PG27AQDP (480 Hz) and the QD-OLED PG27UCDM are separate models.

Specification	LG UltraGear 27GX790A-B	ASUS ROG Swift OLED PG27AQDM
Release year	2025	2023
Model	27GX790A-B (US version 27GX790A-B.AUS) LG’s US spec sheet carries a 2024 copyright; LG Brazil lists the model as a 2025 product. LG	—
Panel	26.5-inch (27-inch class) OLED, 16:9 The actual viewable diagonal is 26.5 inches. LG	26.5-inch WOLED; 2560 × 1440 (16:9); 0.229 mm pixel pitch; anti-glare surface WOLED is LG Display’s panel type using a white OLED layer with colour filters; each pixel makes its own light, so blacks go fully dark. Long-lasting static images raise the risk of burn-in. ASUS
Resolution and pixel pitch	2560 × 1440 (QHD); 0.2292 mm pixel pitch QHD at 27 inches means lower pixel density than 4K; small text looks less crisp but high frame rates are easier to reach on the GPU. LG	—
Refresh rate	480 Hz 480 Hz means up to 480 frames per second; seeing that benefit requires the game and GPU to deliver close to 480 fps. LG	—
Response time	0.03 ms (GtG) Grey-to-grey pixel transition time; it is not input lag. LG	—
Brightness	Typical 275 cd/m² (min 250); HDR peak at 1.5% APL typical 1,300 cd/m² (min 1,040) 1,300 nits applies only to small highlights covering 1.5% of the screen; on a full white screen OLED automatic brightness limiting kicks in. LG	—
Contrast	1,500,000:1 (typical) OLED pixels can switch fully off, so black level is near zero; LG’s page notes the figure is measured at 25% APL. LG	—
Colour	DCI-P3 98.5% (CIE 1976); 10-bit (1.07 billion colours) The sheet lists a paper calibration report in the box. LG	DCI-P3 99%; sRGB 135%; factory pre-calibration report ASUS
HDR	HDR10; VESA DisplayHDR True Black 400 True Black is the VESA HDR tier for very low black-level displays such as OLED. LG	HDR10 Dolby Vision and HDR10+ support are not listed. ASUS
Variable refresh	VESA AdaptiveSync; NVIDIA G-SYNC Compatible; AMD FreeSync Premium Pro Variable refresh matches the panel to the GPU frame rate to reduce tearing and stutter. LG’s page also lists VESA ClearMR 21000 certification. LG	VESA AdaptiveSync Display 240Hz; AMD FreeSync Premium; G-SYNC Compatible Variable refresh matches the monitor to the graphics card’s frame rate to reduce tearing and stutter. ASUS
Screen surface	Anti-glare, low-reflection front polariser LG	—
Inputs	2× HDMI (HDMI 2.1 FRL compliant); 1× DisplayPort 2.1 FRL is the high-bandwidth transfer mode of HDMI 2.1. There is no USB-C video input. LG	1 × DisplayPort 1.4 DSC; 2 × HDMI 2.0; headphone jack; 2 × USB 3.2 Gen 1 Type-A hub DSC (Display Stream Compression) compresses the signal without visible loss so DisplayPort 1.4 has enough bandwidth for high refresh rates. There are no speakers and no USB-C input. ASUS
USB and audio	USB 3.0: 1 upstream, 2 downstream; 4-pole headphone out (sound + mic); DTS Headphone:X No built-in speakers are listed. LG	—
Stand	Tilt -5°/15°; swivel -30°/30°; height 110 mm; clockwise pivot; VESA 100 × 100 It has a tool-free 1Click stand mount and hexagonal RGB lighting on the back. LG	—
Power	External adapter, 100–240 V; under 0.5 W in sleep, under 0.3 W off The sheet does not list typical power consumption. LG	External power adapter; 100–240 V, 50/60 Hz ASUS
Burn-in care	OLED Care LG says the feature helps prevent burn-in from static high-contrast images left on screen for long periods but may not prevent all image retention. LG	—
Size and weight	With stand 23.8 × 22.8 × 9.8 in (raised), 20.5 lb; without stand 23.8 × 13.8 × 1.8 in, 11.2 lb About 9.3 kg with stand, about 5.1 kg without. LG	With stand 60.5 × 54.8 × 27.4 cm, 6.9 kg; without stand 60.5 × 35.1 × 5.0 cm, 4.2 kg ASUS
In the box	Power cord, DisplayPort 2.1 cable, HDMI 2.1 cable, USB A-to-B cable, paper calibration report LG	—
Refresh rate and response	—	240 Hz (DisplayPort); 120 Hz over HDMI; 0.03 ms (GtG) 240 Hz is only available through the DisplayPort input; ASUS’s signal table limits the HDMI inputs to 120 Hz. For PC games above 120 Hz, use a DisplayPort cable. ASUS
Brightness and contrast	—	HDR peak 1,000 cd/m²; contrast 1,500,000:1; 10-bit (1.07 billion colours) Peak brightness applies to a small part of the screen; with a full white screen brightness drops noticeably. ASUS notes peak brightness may vary with colour pre-calibration. ASUS
OLED care and warranty	—	ASUS OLED Care; 2-year warranty (including panel burn-in) The warranty also covers panel burn-in; terms may vary by region. ASUS
Stand and mounting	—	Tilt +20° / −5°; swivel ±30°; pivot ±90°; 0–110 mm height; 1/4-inch tripod socket; VESA 100 × 100 (with kit); Aura RGB The VESA mount kit is included in the box. ASUS
Certifications	—	TÜV Flicker-free; TÜV Low Blue Light (hardware solution) ASUS