The KOORUI S2721XO is a high-performance 27-inch gaming monitor that brings professional-grade QD-OLED technology to a more accessible price point. Combining a crisp QHD resolution with a massive 240Hz refresh rate, it is built for competitive eSports where motion clarity is king. Thanks to its self-emissive pixels, it achieves true blacks and a near-instant 0.03ms response time, effectively eliminating motion blur and ghosting.

​Key Features

QD-OLED Panel: Uses Samsung’s Quantum Dot OLED technology for infinite contrast and vibrant, cinematic colors.

240Hz Refresh Rate: Delivers ultra-smooth visuals, providing a significant edge in fast-paced shooters.

0.03ms (GtG) Response Time: One of the fastest response times available, ensuring zero trailing behind moving objects.

OLED Care: Includes built-in protections like Pixel Shift and Brightness Adjustment to mitigate the risk of burn-in.

HDMI 2.1 Support: Allows for high-refresh-rate gaming on both PC and latest-gen consoles (PS5/Xbox Series X).

Technical Specifications

Display Performance

Panel Type: QD-OLED (Flat)

Screen Size: 27-inch

Resolution: 2560 x 1440 (QHD)

Aspect Ratio: 16:9

Refresh Rate: 240Hz

Response Time: 0.03ms (GtG)

Brightness: 250 nits (SDR Typ.) / 1000 nits (HDR Peak)

Contrast Ratio: 1,500,000:1 (Static)

HDR: VESA DisplayHDR True Black 400

Color & Imaging

Color Depth: 1.07 Billion (True 10-bit)

Color Gamut: 99% DCI-P3 / 100% sRGB

Viewing Angle: 178° (H) / 178° (V)

Sync Tech: AMD FreeSync Premium / G-Sync Compatible

Connectivity

Video Ports: 2 x HDMI 2.1, 1 x DisplayPort 1.4

Audio: 1 x 3.5mm Headphone-out

KVM Switch: Supported (Control two PCs with one keyboard/mouse)

Design & Ergonomics

Height Adjustment: 0 ~ 110 mm

Swivel: -20° ~ 20°

Tilt: -5° ~ 20°

Pivot: -90° ~ 90° (Portrait mode support)

VESA Mount: 100 x 100 mm