my brand new gtx 670 keeps failing wu's at stock clock! i was doing a 24hour test before starting to push the clocks up but it has fail some units 4 or 5 times. it averages out failing every 3 hours. it is not over heating and according to msi afterburner and gpuz it hasn't exceed 69c. the card is boosting to 1188-1251mhz even though it says in gpuz that it should only boost to 1098mhz. it can do run of heaven 4.0 sometimes but most of the time it crashes and either says the uigine engine stopped working or the display driver crashed. 
i've up dated the drivers and it was stable over night but it seems to be failing again this morning. i've down clocked it and it has failed again.