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A white 31.5 inch 4K monitor on a silver Ergo Arm stand

BenQ Refurbished

BenQ RD320UA-R 31.5" 4K monitor with Ergo Arm

SKU CH-RJ69-4JHDG MPN RD320UA-R

A 31.5" 4K IPS monitor with 400 nits brightness, 2000:1 contrast, USB-C 90W power delivery, KVM switch, and an included Ergo Arm for flexible positioning

  • Screen size31.5 in (80 cm)
  • Pixel response time5 ms
  • Image brightness400 cd/m2
  • Colors displayed1.07 Billion
  • Contrast2000:1
  • Screen ratio16:9
  • Sharp 4K code view on 31.5" 3840 x 2160 IPS
  • Deep contrast for dark themes at 2000:1 static ratio
  • Bright HDR10 highlights at 400 nits with 1.07 billion colours
  • Ergonomic Ergo Arm included for flexible desk positioning
  • USB-C 90W daisy-chain plus KVM streamlines multi-device workflow

31.5" 4K IPS panel with Ergo Arm

This 31.5 inch monitor uses an IPS panel at 3840 x 2160 resolution and a 16:9 aspect ratio. It reaches 400 nits brightness with a 2000:1 static contrast ratio and 1.07 billion colours with HDR10 support. The 5 ms grey-to-grey response time and 60 Hz refresh rate suit coding and general desktop work. The package includes the Ergo Arm stand for flexible positioning.

Suited for programmers and multi-taskers.

Coding modes and Display Pilot 2 software help developers arrange code windows and reduce eye strain. USB-C daisy-chain support and a built-in KVM simplify two-system setups with a single keyboard and mouse. Integrated lighting adds ambient bias illumination. Competitive gamers who need refresh rates above 60 Hz or adaptive-sync certification should look elsewhere.

90 W USB-C power delivery decides single-cable

The USB-C port supplies up to 90 W of power while carrying video and data, letting many modern laptops run and charge through one cable. HDMI and DisplayPort inputs are also available for additional devices. VESA 100 x 100 mm mounting holes remain accessible if the Ergo Arm is removed.

How it compares

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

Price $577.99
Pricier than about 90% of the 530 comparable items (median $193.49).
Screen size 31.5 in (80 cm)
Higher than about 86% of the 479 comparable items (median 27 in).
Pixel response time 5 ms
Typical for this category: the median of 368 items is 5 ms.

Specifications

Product
Brand nameBenQ
Model nameRD320UA
Part numberRD320UA-R
Case colorWhite
Display
Screen size31.5 in (80 cm)
Pixel response time5 ms
Image brightness400 cd/m2
Colors displayed1.07 Billion
Contrast2000:1
Screen ratio16:9
Viewing angles178° (H) / 178° (V)
Size & build
VESA mounting pattern100 × 100 mm
Shipping weight10.98 kg
Package size714 × 602 × 478 mm

Questions about this item

Does the monitor need a separate VESA mount or is the Ergo Arm included?

The Ergo Arm is included and attaches to the 100 x 100 mm VESA pattern on the back of the 31.5" panel.

Can I run the 3840 x 2160 60 Hz signal over HDMI and DisplayPort at the same time for a dual-PC KVM setup?

Yes, the KVM switches between the HDMI and DisplayPort inputs while the USB 3.2 Gen 2 hub stays connected to the active system.

How do I confirm the USB-C daisy chain is delivering 90 W to my laptop?

The Display Pilot 2 software reports the active power delivery and shows the 400 nits HDR10 mode when the chain is working.

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