Right, Have now changed Mobo, GPU (GTX 295), CPU (quad core now), PSU and RAM and am still getting this problem. I've been using MSI Afterburner lately which has helped as long as I set the fan to a continuous speed so you may be right about the under load issue but what can I do about that other than what I am already? I'm about ready to dump it all in a skip and buy a mac (words i never thought I'd say) :p