Guys, Specs are in sig, I have a few movies on my system in the matroska format (.mkv) Each play fine whilst in windowed mode, but as soon a I full screen them I experience some choppyness, I am not sure how to describle it, it's like frame stutter. It is pretty much constant, but only slight, still extremely annoying though! I have VSYNC forced on in the nvidia control panel. Surely my CPU should be able to handle 1080p? My 9800GTX+ is overclocked to 800/1200, I've tried all sorts of CPU priority setings. I am running Windows 7, during playback my CPU utilization is around 60-70% Any idea's?