LG UltraGear 27GX790A-B / ASUS ROG Swift OLED PG34WCDM

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

ASUS ROG Swift OLED PG34WCDM: PG34WCDM (2024). 34-inch class (33.94-inch) 800R curved WOLED.

Specification	LG UltraGear 27GX790A-B	ASUS ROG Swift OLED PG34WCDM
Release year	2025	2024
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	33.94-inch WOLED; 3440 × 1440; 21:9; 800R curve; anti-glare (matte) surface 800R means the screen curves like an arc of a circle with an 800 mm radius. Pixel pitch is 0.231 mm. 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	10-bit (1.07 billion colours); DCI-P3 99%, sRGB 135%; ΔE ≤ 2; 1,500,000:1 contrast A factory colour calibration report is in the box. 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	—
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	—
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	—
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	31 W consumption; external power adapter; 100–240 V 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 78.6 × 55.1 × 29.3 cm and 8.4 kg; without stand 78.6 × 37.2 × 16.1 cm and 5.6 kg ASUS notes dimensions and weight may vary by region. 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; 0.03 ms (GtG); Adaptive-Sync VRR ASUS lists VESA AdaptiveSync Display 240Hz, AMD FreeSync Premium Pro and G-SYNC Compatible certification. ASUS
Brightness and HDR	—	1300 cd/m² HDR peak brightness; HDR10; VESA DisplayHDR 400 True Black ASUS gives this figure, asterisked, as peak HDR brightness; it is not sustained full-screen brightness. ASUS
Video inputs	—	1 × DisplayPort 1.4 (DSC); 2 × HDMI 2.1 (FRL); 1 × USB-C (DP Alt Mode, 90 W power) The USB-C input can take video from a laptop over one cable while charging it at up to 90 W. All three inputs support vertical frequencies up to 240 Hz. ASUS
Other connections and features	—	USB hub: 2 × USB 3.2 Gen 1 Type-A, 1 × USB 2.0 Type-A; KVM switch; optical audio (S/PDIF) out; headphone out; no built-in speakers; proximity sensor With KVM a keyboard and mouse plugged into the monitor can be shared between two computers. ASUS
Stand and mounting	—	Tilt +20° / −5°, swivel ±15°, height 0–110 mm; VESA 100 × 100 mm; 1/4-inch tripod socket; Kensington lock The tripod socket is for mounting a camera or light on top of the stand. ASUS