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To compare the GP27Q’s performance, I’ve rounded up a mixed group of screens ranging from 160 to 240 Hz. Since buyers will want to compare Cooler Master’s Tempest GP27U, I’ve included it as the only 4K panel. QHD monitors are also available in 240 Hz so the BenQ EX270QM represents that category. The others are more directly comparable – Galax’s VI-01, Gigabyte’s M27QP and the HyperX Armada 27 from HP.
Pixel Response and Input Lag
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240 Hz will always deliver a smoother moving image regardless of panel resolution. 4ms is visibly better than 6ms which you can expect from any 165 or 170 Hz monitor. The GP27Q is on par with other screens at this speed. It has a better overdrive than the others though, which is a major point in its favor. You can also engage a backlight strobe that doesn’t exhibit the phasing artifact common to this technology. The GP27Q offers many choices, all of them good.
It also has lower input lag than many other screens with only a 2ms deficit to the 240 Hz BenQ. You can also see that the GP27U matches numbers though it is pushing more pixels. That choice comes down to video cards. If you have enough GPU power to run at 160fps, then the extra resolution is a benefit. But if your PC is not high budget, the QHD GP27Q is the better choice.
Viewing Angles
The GP27Q has some of the best off-axis image quality I’ve seen to date. At 45 degrees to the side, only a tiny reduction in brightness can be seen. There is no color shift or change in detail rendering. It doesn’t get much better than that. The top view is green and red in tone, but detail isn’t washed out too badly.
Screen Uniformity
To learn how we measure screen uniformity, click here.
Obviously, Cooler Master takes quality control seriously. The two GP27s are among the very best samples I’ve ever tested for screen uniformity. 3.15% is well below the visible threshold. You won’t see any glow or bleed, or anomalies of any kind. Full field patterns of every color and brightness level are perfect from edge to edge.
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