Currently my GPU, 8800 GTS 640 is not overclocked. I have started to notice white flashes in certain situations. For example, starting up at a country airport in Alaska and use the hat switch to look around it spot view - get some quick white flashes. This did not happen before. Happens with the 174.74 and the 180.4x driver also.
99% of the time all is well and this is more of a "what's happening" rather than an "OMIGOD".