Originally posted by: smithkt
This sounds eerily similar to the problems people (including myself) were reporting 7-8 months ago with 8800GT boards. The Power Sentinel was downclocking boards as a result of an incorrect determination that the power supply was insufficient. At the time, I waited 2 1/2 months for a driver release to correct the problem. I believe it was 169.44 at that time. That fix should have been in all the new releases since then. Not saying it's the same problem, but the symptoms sound exactly the same. Unexplained poor frame rates despite all the clocks being reported correctly.
For a while, people were blaming the PSUs, but eventually, Nvidia released the driver fix.
People running Vista received no warning. People running XP would get a warning message when Windows started up.
It would be a shame if this is the same issue popping up again.