happens to me reproducable in am3, 03 and 05, partly 01 with 8800 GTS sli on 275 driver...everything I tested until now (as I think it is a driver / software issue I thought it should be mentioned with 580 gtx also)
1598 bios MIVE + 2600K ~5650 btw
€: here is a little comparison I just did an hour before
AB off
AB ON
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