At CeBIT 2008
we had a chance to test a Phenom 8600 with the J&W RS780UVD-AM+ board. We could not do an extensive test, but it should give you some impressions.
As expected, this B2 stepping CPU is running at the same speed as the 9600. While we have a Black Edition which can change the multiplier, overclocking on this Tri-Core is limited. Also the BIOS was still beta, so we could only do overclock with FSB @ 230MHz.