Yup, that's a good idea too. But I already replaced my GTX-285 video card with an older GT 8600 card, without seeing a change. Just to try everything, I also found a three or four month old version of the driver and tried that too. Again, no change.
I just ordered my third phenom II x4 965 BE CPU tonight. This will be my last attempt to fix the problem with a new CPU. If they have this many of these CPUs in the supply lines with underspeed hypertransport interfaces, I will wait for some future CPU model before I try again. I don't know what else to try.
Hmm... your case is a definitely remarkable one. Perhaps you've really managed to find a serious problem. Did you try to post somewhere on AMD Developers Blog? Maybe you'll manage to get response that way.