Kazgirl(and all others Phenom owners),just one question about your Phenom sub par Game testing(compared to A64).
Did you by any chance try the Phenom X4 driver from AMD's website?Could have been that TSC of the cores are not in sync?
It's just a wild shot,but could be a good try .We need better BIOS and a better chipset drivers for 790FX.

Good luck