I am able to get 4k 60htz without any problems on windows 10 only. It looks wonderful! However the mouse so slow to move around!! trying to play starcraft is almost impossible due to the slow mouse moves. Its not until i scale to 1280x768 does it become more fluid. Anyone know why this is? Here is proof i got 60hz on hdmi. even when i change it to 30hz same problem very slow mouse!! This is a 70inch 4k btw.