One would think with the progress of hardware and software that tolerances of certain products and materials will be higher. I didn't just start over clocking yesterday. Been doing it for many years now with increasingly higher performing hardware and never had such an incidence. Just the uneventful no post screen which nevers stopped anyone! This is obviously a memory handling issue related to Vista and drivers. It will not make me stop over clocking. Rule number 2 says if clocking and loving it why stop?