^ GTX960 here. More or less the same situation. It was unsupported and worked funny with nouveau, but the Nvidia drivers were not available when I got it. Had to wait for months to be able grab drivers from experimental... and crossing fingers. It worked fine in the end. I've got the drivers from Sid now and I have no performance complaints at all. Anyway, I'd like to bounce back to nouveau if possible. I should check if this card is finally fully suported to test it and check if vdpau works as good as with proprietary with mpv.