ASUS ROG Swift OLED PG27UCDM / LG UltraGear 27GX790A-B

The small pixel pitch (about 166 ppi) makes text and interface edges look sharper than on 27-inch 1440p monitors.

The actual viewable diagonal is 26.5 inches.

All inputs support 240 Hz at 4K; variable refresh prevents tearing and stutter as the game frame rate moves between 48 and 240.

Grey-to-grey transition time; because OLED pixels change much faster than LCD, motion blur depends mostly on the refresh rate.

Grey-to-grey pixel transition time; it is not input lag.

1,000 cd/m² is a peak reached on a small area of the screen; a full white screen stays much lower. ASUS gives no typical SDR brightness value.

The True Black tier measures OLED’s very low black level; 400 is the minimum peak brightness threshold in the certification test. Dolby Vision support lets compatible sources use scene-by-scene HDR data.

True Black is the VESA HDR tier for very low black-level displays such as OLED.

ΔE < 2 means factory calibration deviates from target colours by an amount most people cannot see; a calibration report is included.

The sheet lists a paper calibration report in the box.

USB-C takes video over a single cable and supplies up to 90 W to a laptop. The HDMI 2.1 inputs can be used for 4K 120 Hz on consoles.

FRL is the high-bandwidth transfer mode of HDMI 2.1. There is no USB-C video input.

KVM moves the keyboard and mouse attached to the monitor between two computers when the input is switched.

A headphone jack or external speakers are needed for audio.

OLED Care includes burn-in prevention functions such as pixel cleaning, screen shift, logo brightness adjustment and taskbar detection. The proximity sensor dims the screen when the user leaves, reducing static image time.

The tripod socket is used to mount accessories such as a camera or light on the stand.

Warranty terms can vary by country.

LG’s US spec sheet carries a 2024 copyright; LG Brazil lists the model as a 2025 product.

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.

480 Hz means up to 480 frames per second; seeing that benefit requires the game and GPU to deliver close to 480 fps.

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.

OLED pixels can switch fully off, so black level is near zero; LG’s page notes the figure is measured at 25% APL.

Variable refresh matches the panel to the GPU frame rate to reduce tearing and stutter. LG’s page also lists VESA ClearMR 21000 certification.

No built-in speakers are listed.

It has a tool-free 1Click stand mount and hexagonal RGB lighting on the back.

The sheet does not list typical power consumption.

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.

About 9.3 kg with stand, about 5.1 kg without.