Works fine, BruceX test result 17,1 sec.
But BruceX test don't show real situation when I need handle 4K video. Playback is on smooth at all. Now I have new iMac Retina 5K, 4,2 GHz i7 with Radeon Pro 580. BruceX result is slower (22,4 sec) but it plays 4K videos as smooth as silk. In QuickTime...