Does the board have the option of turning the TLB workaround off? Because if so, I'd do it. For crunching, it isn't an issue, but the workaround in the bios for the TLB does hinder performance greatly. I had a 9600BE crunching and made sure the TLB thing wasn't enabled, and it crunched fine.

I've heard rumors that certain windows OSes on certain service packs automatically force the TLB thing (though maybe that was just rumors).