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A 27 inch curved QHD gaming monitor on a height adjustable stand

AOC Monitors

AOC Monitors CQ27G4ZH 27" Curved QHD 300Hz Gaming Monitor

SKU CH-4BJ8-DK2S5

A 27-inch curved QHD gaming monitor delivering a 300Hz refresh rate and 0.5ms response time with a height-adjustable stand

  • Screen size27 in (68.6 cm)
  • Display resolution2560 × 1440 (2K)
  • Refresh frequency300 Hz
  • Pixel response time0.5 ms
  • Screen curvatureCurved
  • Display formatQHD
  • 300 Hz refresh rate via DisplayPort delivers ultra-smooth motion for competitive play
  • 5 ms response time reduces ghosting so fast action stays sharp
  • 1500R curvature wraps the 27 inch QHD panel for a wider, more immersive field of view
  • Flicker-Free and low blue light modes help reduce eye strain during long sessions
  • Height, swivel and tilt adjustable stand lets you set the perfect viewing angle

27-Inch Curved QHD Gaming Monitor

The AOC CQ27G4ZH is a 27-inch curved gaming monitor built for competitive players who want high motion clarity at QHD resolution. Its 1500R curvature wraps the 2560 x 1440 panel around the viewer for a more immersive field of view. The stand provides height, swivel and tilt adjustment so the screen can be positioned for long sessions. Flicker-Free and low blue light modes help reduce eye strain during extended use.

300Hz Refresh Rate and 0.5ms Response

Over DisplayPort the monitor reaches a 300Hz refresh rate, giving ample headroom for fast-paced shooters and high-frame-rate esports titles. The 0.5ms response time keeps ghosting low when frame times are short. At 144Hz over HDMI the panel still delivers smooth motion, though the highest refresh headroom is only available on the DisplayPort input. The QHD resolution balances detail and GPU load for mid-range and high-end graphics cards.

DisplayPort and HDMI Interface Limits

The single DisplayPort connection unlocks the full 300Hz at 2560 x 1440, while the two HDMI ports are limited to 144Hz at the same resolution. Builders needing multiple high-refresh DisplayPort inputs will find only one available. The monitor includes VESA mounting compatibility and a quick-release stand for arm or wall installations. Users requiring higher refresh rates or different aspect ratios should consider other models.

How it compares

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

Price $278.99
Pricier than about 69% of the 839 comparable items (median $189.99).
Screen size 27 in (68.6 cm)
Typical for this category: the median of 814 items is 27 in.
Refresh frequency 300 Hz
Higher than about 90% of the 735 comparable items (median 180 Hz).

Specifications

Product
Brand nameAOC
Display
Screen size27 in (68.6 cm)
Display resolution2560 × 1440 (2K)
Refresh frequency300 Hz
Pixel response time0.5 ms
Screen curvatureCurved
Display formatQHD
Highest resolution2560 × 1440
Ports & slots
Connection typesHDMI, DisplayPort
HDMI portsYes
DisplayPort connectors1
Video connectors3 x DisplayPort
Size & build
Stand adjustabilityHeight, Swivel, Tilt

Questions about this item

Will the 300Hz refresh rate work with my older graphics card that only has HDMI 2.0?

The monitor delivers 300Hz over DisplayPort; HDMI is limited to 144Hz, so an older HDMI 2.0 card will run at 144Hz maximum.

How can I verify the 0.5ms response time is active after I connect the DisplayPort cable?

Enable the overdrive setting in the OSD and confirm the on-screen information shows 300Hz; the panel’s MPRT spec of 0.5ms is then in effect.

Does the box include both a DisplayPort cable and an HDMI cable, or do I need to buy one separately?

The package contains the monitor, the height-adjustable stand with quick release, a power cable and a DisplayPort cable; an HDMI cable is not included.

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