MSI MPG 321URX QD-OLED / LG UltraGear 27GP750-B

MSI MPG 321URX QD-OLED: MPG 321URX QD-OLED, black. The DisplayPort 2.1 MPG 322URX QD-OLED and the white MPG 321URXW are separate models.

LG UltraGear 27GP750-B: 27GP750-B; 27-inch Full HD 240 Hz IPS gaming monitor (Canadian spec table). The higher-resolution 27GP850-B and the OLED UltraGear models are separate products.

Specification	MSI MPG 321URX QD-OLED	LG UltraGear 27GP750-B
Release year	2024	2021
Panel	31.5-inch flat QD-OLED; 3840 × 2160; 0.1814 mm pixel pitch; anti-reflection surface QD-OLED converts blue OLED light to red and green with quantum dots; because each pixel makes its own light, blacks can switch fully off. 4K at 32 inches gives roughly 140 ppi. MSI	27-inch (68.5 cm) IPS; 1920 × 1080; 16:9; pixel pitch 0.3108 mm A 0.31 mm pixel pitch works out to about 82 ppi at 27 inches. Viewing angles are 178°/178°. LG
Refresh and response	240 Hz (48–240 Hz variable range); 0.03 ms GtG MSI says 240 Hz at 4K is reachable over DisplayPort 1.4a, HDMI 2.1 and USB-C alike. 0.03 ms is grey-to-grey transition time, not total input lag. MSI	Up to 240 Hz; 1 ms (GtG, in Faster mode) LG quotes 1 ms for grey-to-grey transitions at the fastest overdrive setting. Dynamic Action Sync aims to reduce input lag, and Black Stabilizer brings out detail in dark scenes. LG
Brightness and HDR	250 nits typical; DisplayHDR True Black 400; 1,500,000:1 typical contrast DisplayHDR True Black 400 is the VESA class for displays that can produce deep blacks such as OLED; it requires 400-nit small-area brightness and a very low black level. 250 nits is the full-screen SDR figure. MSI	—
Colour	10-bit (1.07 billion colours); 99% DCI-P3, 97% Adobe RGB, 138% sRGB 138% sRGB means the gamut extends well beyond sRGB; use the monitor’s sRGB mode so sRGB content does not look oversaturated. MSI	—
Adaptive sync	G-SYNC Compatible; AMD FreeSync Premium Pro Adaptive sync matches the display refresh to the game’s frame rate to reduce tearing and stutter. FreeSync Premium Pro adds a low-latency requirement in HDR. MSI	—
Inputs	1 × DisplayPort 1.4a; 2 × HDMI 2.1; 1 × USB-C (DP Alt Mode, 90 W PD); 2 × USB 2.0 Type-A, 1 × USB 2.0 Type-B; headphone out The USB-C input can carry video and charge a laptop at up to 90 W over a single cable. Display Ninja says the monitor has a built-in KVM; the USB-A ports run at USB 2.0 speed. MSI	—
Stand and mounting	Tilt −5/15°, swivel ±30°, pivot ±10°, 110 mm height adjustment; VESA 100 × 100 MSI	Height, tilt and pivot adjustment; VESA 100 × 100 Height adjustment changes the overall height with the stand between 465.9 and 575.9 mm. LG
Size and weight	With stand 718 × 242 × 483 mm; without stand 718 × 69 × 418 mm; 9.6 kg net MSI	Without stand 614.2 × 364.8 × 51.7 mm, 3.9 kg; with stand 6 kg LG
Warranty	3 years, including panel burn-in On OLED panels, images left static for long periods can leave a permanent mark (burn-in); MSI covers this risk under warranty. Terms may vary by country. MSI	—
Variable refresh	—	NVIDIA G-SYNC Compatible; AMD FreeSync Premium Variable refresh matches the monitor’s refresh rate to the graphics card’s frame rate to reduce tearing and stutter. LG
Brightness and contrast	—	400 cd/m² typical (minimum 320); 1000:1 typical contrast (minimum 700:1) LG
Colour and HDR	—	99% sRGB typical (minimum 95%, CIE1931); 16.7 million colours; HDR10; factory calibrated HDR10 signals are accepted; LG lists no DisplayHDR certification in the spec table, and typical brightness is 400 cd/m². LG
Connections	—	2 × HDMI; 1 × DisplayPort 1.4; 3.5 mm headphone out A DisplayPort cable is in the box. There are no built-in speakers or USB hub. LG
Power	—	External adapter; 45 W typical, 48 W maximum; under 0.5 W in sleep LG