I resently bought a new motherboard so I'd have room to fit a Physx card in. Ever since its been in, my PC seems to have become much more unstable. It's not BSODing but programs keep freezing and I have to wait about 30 seconds before normal service resumes. Aswell as the new motherboard and Physx card, I also put in some new RAM, could this be causing it? On paper, the motherboard and RAM should be technically better than my old stuff, but it doesnt seem that way so far. Anyway, here's some specs: AMD Athlon 64 X2 6400 CPU Gigabyte GA-MA790FX-DQ6 motherboard Corsair Dominator CM2X1024-8500C5D RAM (4x1GB sticks) running at DDR2-800 The motherboard and RAM I had in before was: ASRock ALiveNF6G-DVI and 4x1GB of super ****** Kingston RAM (cheapest I could find, can't remember what model it was) Nothing has been overclocked and all drivers are up to date. I am running Vista which is apparently chock full of problems, but I've never experienced this before. Any ideas? Thanks in advance EDIT: I've done a memory test and a full stabilty test and everything seems fine. Can't think why it would be happening.