cpu-z can't show you "sub-revision"
in fact there are only two steppings of K10 - B1 and B2
B1 consists of B1 (engineering samples) and BA (Opterons at 1,9 and 2 GHz). B1 and BA obviously are very similar, BA is just "more advanced" and latest version of B1 revision
B2 is high-clock revision (they promise up to 3GHz)
S7, you should show us something new. Remove one of the cpus and run 3dmark on single-socket configuration (let the bios stay old, that doesn't matter)
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