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HDR Testing
Following on from the SDR results on the previous page, here we re-test the relevant areas of the display with HDR enabled.
Brightness
HDR brightness is very impressive. Cooler Master claims a peak of 1500 nits, but we hit 1604 nits at a 10% APL. This does tail off at smaller window sizes, with a 1% APL delivering 992 nits, but that is still very impressive for a relatively budget HDR screen. Full screen brightness is also a rather eye-searing 1145 nits, one area where we see a clear advantage to mini-LED versus OLED, considering OLEDs can't typically sustain full-screen brightness above 250 nits.
Greyscale
Above I tested all three HDR modes on offer – User, Movie and Game. You can see the results are identical – after discussions with Cooler Master, it turns out that the different modes are simply to allow users to tweak various settings and save them as profiles – so the names being ‘Game' or ‘Movie' is rather meaningless as they don't feature any specific optimisations for games or films. But at least you can tinker with 3 separate profiles should you wish.
Either way, HDR accuracy is decent. You may have seen some previous reviews of the GP2711 that demonstrated very dark EOTF tracking, but with the latest firmware (V1.05) I am pleased to say this is now fixed and EOTF is generally accurate, being just a touch too bright for the lower-mid tones. We do still see a warm overall tint, especially when look at brighter shades, but user colour balance is still an option with HDR enabled.
Colour Accuracy
Overall colour accuracy is reasonable in HDR, too. We show figures with and without luminance error, and in both cases we're looking at an average dE of below 3, so that's not a bad result. The main offenders are the 100% cyan and 100% green channels, which the GP2711 can't accurately display as it doesn't cover the entirety of the Rec.2020 colour space.
