If you are interested in synthetics, I would recommend crystalmark. The FPU and ALU tests are rather good. But they do have one flaw: they will only use up to 4 CPU cores during testing. My friend's core i7 980X performed like a 4-core at the same speeds and what I have seen of the phenom IIx6, crystalmark benches it like a phenom IIx4.
The other tests are pretty good but the 3d graphics test is not very good.