I recently built an i7 machine (in signature) and I'm having problem with it randomly restarting. If I leave it on all night every morning I come in and find that windows 7 shut down unexpectedly. I'm not entirely sure what the problem is, but I suspect that its my ram. I have ocz gold 3x2gb rated 9-9-9-20 @1333mhz. I'm having trouble, however, even running them at 1066mhz. Prime 95 (torture test that test cpu and ram) starts to return errors in about 30 seconds, but the one that doesn't really test the ram doesn't return these errors. In my bios I've just got everything set at auto right now which my ram at 7-7-7-20 @ 1066mhz. I've tried manually setting the voltage (1.64v) and the speed to 1066mhz but it still returns errors very soon. I've run memtest 1 time a few weeks ago and the ram passed then. I'm really hoping to just get my system stable before I try and over clock it.