Im also haveing some sort problem when ever im gameing my pc will hard freeze then my display goes black saying no signal but pc turns at first i was thinking its the oc on the cpu but i left it stock for while and it happend again last night thing is sometimes it can take days or weeks for it to happen but when it does it normally good for few days/weeks till it happens iv let my mb setttings at stock and ram back to stock it only happend when i got new mb from ebay i had to reinstall windows so im thinking maybe its the mb or bad windows install.