The specs in my profile are what I'm using now, though the i7 920 is running at stock speeds and voltages with HT turned off. Anyway, I've had this issue for over a year now. I notice a little stuttering in the sound which first tips me off. Eventually it happens more often and gets worse, eventually the computer will crash. My temperatures are kind of high, but I didn't think they were alarmingly high. My idle CPU temp is about 50C, under load it gets to about 68C. It's high considering I have an aftermarket cooler, but I don't think it should be causing these issues. A reboot usually fixes the issue and I don't notice it again for a day or so. I've tried clean installations of Windows to make sure it wasn't a software issue. Should I apply new thermal grease and make sure the fan is on right to ensure its not a temperature issue? If that's not it, what else could it be? Also I just had a new issue...rather than a blue screen or crash, the stuttering led to the computer shutting down. But it shutdown the normal way as if I told Windows to shut down. It closed the open programs, said it was shutting down and then did. That was new and I haven't seen it before. I'm going to look for the grease now and do that, but I'd be curious to hear any thoughts you guys have.