Why you can trust 3DTested Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test.

Go to page:

Response, Input Lag, Viewing Angles and Uniformity

300 Hz is a refresh rate I have not seen before, so I lined up screens ranging from 180 to 240 Hz for the CQ27G4ZH’s comparison. They are ViewSonic’s XG2736-2K, Titan Army’s P32A2S2, Gigabyte’s M27QA ICE and GS27QXA, and Xiaomi’s G Pro 27i.

Pixel Response and Input Lag

Image 1 of 2

The obvious conclusion to draw from the above is that 300 Hz offers no significant advantage. But since AOC isn’t charging extra, there is no reason not to like it. With a 4ms panel response time, this is about as smooth as an LCD gets. The CQ27G4ZH overdrive is very good with no significant ghosting artifacts. You can alternately use the backlight strobe to make motion even smoother. Input lag is very low at 18ms, pipped only by ViewSonic’s XG2736-2K. It beats the 260 Hz Gigabyte by 3ms so that’s a win.

Test Takeaway: The CQ27G4ZH is an extremely responsive gaming monitor with no perceivable lag and smooth motion processing. A 240 Hz OLED will be smoother, but only just a bit. At this price level, the CQ27G4ZH is extremely competitive with the best 27-inch QHD value screens I’ve tested.

Viewing Angles

The CQ27G4ZH includes a heavy polarizing layer which makes it very sharp and contrasty from the front but quite dim to the sides and above. You can see a major drop in light output and a purple tint. The CQ27G4ZH is definitely not shareable.

Screen Uniformity

To learn how we measure screen uniformity, click here.

In my experience, VA is the least consistent technology for screen uniformity. The CQ27G4ZH does well here with just a slight hotspot noted at the lower right in an all-black field pattern. Brighter screens show no visible anomalies. Color is also smooth toned from edge to edge.