I've recently upgraded to a gtx 1070 and all is fine, except QL. In QL every now and then I get a 'screen glitch' where some kind of random tear or polygon flashes on the screen for a split second. Happens every couple of minutes or so. Drivers are 368.39. Windows 8.1 64bit.

This only happens in Quake, all my other games are fine. Anyone have any suggestions?