Uniformity,Efficiency and FreeSync Gaming
Colour uniformity
Uniformity is generally good, but top-performing monitors tend to have a sub-two per cent deviance across the entire screen.
Luminance uniformity
Luminance is par for the course. About 10 per cent, from best to worst, is not readily noticeable in a well-lit room. With the lights off, however, you can make out that it's not perfectly even.
Modern monitors tend not to chew through too much power, and that is the case here.
Premium FreeSync Gaming
Gaming is this monitor's real forte, particularly with the wide FreeSync range between 40-144Hz.
We fired the system up with a Radeon RX Vega 64 reference card - the fastest the red team does right now - and ran a bunch of games at the standard 1080p resolution.
The good news is that Far Cry 5, Forza Horizon 4, and Shadow of the Tomb Raider tend to average between 80-120fps when run at high/ultra quality settings, which is right in the ballpark of this screen.
The lowest minimum framerate we recorded was 35fps across the titles, and the combination of LFC technology and general smoothing meant that the motion was absolutely stutter- and judder-free during our experience.
And really, you need a card like the RX Vega 64 to get the best out of the screen, because it is able to consistently run at over the basic 48-75Hz range supported on cheaper monitors. If you have a card like the RX 570, for example, investing in this £220 screen makes far less sense.
Overall, the iiyama GB2560HSU is a good gaming monitor if you are able to harness its >75Hz refresh rate consistently. It becomes easy to get used to the buttery-smooth gaming, so much so that going back to a regular screen feels like a proper downgrade in terms of experience.