Trying to figure this out and I haven't had much success. This happens at both stock speeds and slightly overclocked at 765/1115. I'm watching the clock speeds in the sensor tab of GPU-z.
I start the Windows Experience Index test showing 725/1000, as is normal for a stock HD 5850. Once I get about halfway through the test, I see the clocks change to 400/900. On subsequent runnings of the WEI, it starts and ends at the 400/900 speed. The only way to return to the correct 725/1000 is to restart the system. Changing values in CCC does nothing. So if I play a game or benchmark after running the WEI, I obviously have much poorer performance overall (i.e. 7250 furmark score vs. 4000 @ 400/900).
I tried both the previous ATI driver for the 5850 dated in Sept, as well as the one that was just released today (Oct 13th). Same issue with both. Running Windows 7 RC x64. Is WEI known to fool with & lock clock speeds like this? Driver issue? Problem with my Windows installation? Diagnostic/repair attempts show nothing wrong.
I start the Windows Experience Index test showing 725/1000, as is normal for a stock HD 5850. Once I get about halfway through the test, I see the clocks change to 400/900. On subsequent runnings of the WEI, it starts and ends at the 400/900 speed. The only way to return to the correct 725/1000 is to restart the system. Changing values in CCC does nothing. So if I play a game or benchmark after running the WEI, I obviously have much poorer performance overall (i.e. 7250 furmark score vs. 4000 @ 400/900).
I tried both the previous ATI driver for the 5850 dated in Sept, as well as the one that was just released today (Oct 13th). Same issue with both. Running Windows 7 RC x64. Is WEI known to fool with & lock clock speeds like this? Driver issue? Problem with my Windows installation? Diagnostic/repair attempts show nothing wrong.
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