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White 31.5 inch flat OLED gaming monitor on height swivel tilt stand

BenQ

BenQ EX321UZ 31.5" OLED 4K 240Hz gaming monitor

SKU CH-WXW0-6VDVN MPN EX321UZ

A 31.5" OLED panel delivers 4K resolution at 240Hz with 0.03ms response and 99% DCI-P3 colour

  • Screen size31.5 in (80 cm)
  • Display resolution3840 × 2160 (4K)
  • Refresh frequency240 Hz
  • Panel typeOLED
  • Pixel response time0.03 ms
  • HDR formatHDR10
  • Deep blacks from 1,500,000:1 OLED contrast
  • Smooth 4K motion at 240 Hz refresh
  • Near-instant 0.03 ms response for competitive play
  • Tear-free gaming via FreeSync Premium Pro
  • 99 % DCI-P3 colour on 1.07 billion shades

31.5" OLED 4K 240Hz gaming monitor

The BenQ MOBIUZ EX321UZ is a 31.5-inch OLED display built for high-refresh 4K gaming. Its panel delivers a 0.03 ms response time and a 1,500,000:1 contrast ratio with 99% DCI-P3 colour coverage. Connectivity includes two HDMI 2.1 ports, one DisplayPort 1.2 and a USB-C input with DisplayPort Alternate Mode. The stand provides height, swivel and tilt adjustment for ergonomic positioning.

Competitive 4K gamers and HDR media viewers

This monitor suits players who want 240 Hz at 3840 x 2160 with near-instant pixel response and deep blacks. The glossy anti-reflection surface enhances perceived contrast in controlled lighting. Buyers who need higher full-screen brightness for sunlit rooms or who require a curved ultrawide format for immersion should look at alternatives.

0.03 ms OLED response time

The 0.03 ms grey-to-grey transition is the specification that defines motion clarity on this panel. Combined with 240 Hz refresh and FreeSync Premium Pro adaptive sync, it virtually eliminates ghosting and tearing in fast-paced titles. If your workflow prioritises static text clarity or maximum sustained brightness over motion performance, a different panel technology may be preferable.

How it compares

Measured against everything we stock in Monitors for Gamers, at today’s prices. Recalculated every night.

Price $1,157.99
Pricier than about 92% of the 839 comparable items (median $189.99).
Screen size 31.5 in (80 cm)
Higher than about 79% of the 814 comparable items (median 27 in).
Refresh frequency 240 Hz
Higher than about 70% of the 735 comparable items (median 180 Hz).

Specifications

Product
Brand nameBenQ
Product lineMOBIUZ
Model nameEX321UZ
Case colorWhite
Display
Screen size31.5 in (80 cm)
Display resolution3840 × 2160 (4K)
Refresh frequency240 Hz
Panel typeOLED
Pixel response time0.03 ms
HDR formatHDR10
Image brightness300 cd/m2
Screen curvatureFlat Panel
Widescreen formatYes
Screen finishGlossy Anti-Reflection
Display formatUHD
Variable refresh rateFreeSync Premium Pro (AMD Adaptive Sync)
Viewing angles178° (H) / 178° (V)
Screen ratio16:9
Contrast1,500,000:1
Color gamut coverageDCI-P3 99%
Colors displayed1.07 Billion
DisplayHDR certificationDisplayHDR True Black 500
Audio & video
Integrated speakersNo
Integrated webcamNo
Ports & slots
Video connectors1 x DisplayPort 1.2 / 1 x USB-C (DP Alternative) / 2 x HDMI 2.1
USB connections1 x USB Type-C upstream (USB 3.2 Gen 1, 5 Gbit/s, data only)
1 x USB Type-C downstream (USB 3.2 Gen 1, 5 Gbit/s, power charging 7.5 W)
2 x USB Type-A downstream (USB 3.2 Gen 1, 5 Gbit/s, power charging 4.5 W)
Power
Power draw(normal): 45 W
Power Consumption (max): 300 W
Power Consumption (sleep mode): < 0.5 W
Power supply100–240 VAC, 50/60 Hz
Size & build
Stand adjustabilityHeight, Swivel, Tilt
VESA mounting pattern100 × 100 mm
Product dimensions19.61 in-23.54 in × 28.31 in × 8.78 in with stand
16.46 in × 28.31 in × 3.27 in without stand
Product weight18.28 lb with stand
13.21 lb without stand
Shipping weight12.50 kg
Package size824 × 640 × 188 mm

Questions about this item

What refresh rate does the HDMI 2.1 port cap at for 4K on the EX321UZ?

The two HDMI 2.1 ports support 4K UHD at the panel's full 240 Hz refresh rate.

What VESA mount pattern does the 31.5 inch EX321UZ use?

The monitor uses a standard 100 x 100 mm VESA mounting pattern for arms or wall brackets.

How do I enable 240 Hz on the EX321UZ, and what step is often missed?

Connect via DisplayPort 1.2 or HDMI 2.1, then set 240 Hz in Windows display settings; the step often missed is enabling FreeSync Premium Pro in the monitor OSD.

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