Later revisions of the board likely have beefed up power delivery vs. the earlier versions and thus can handle the FX 9590's insane power draw. I would advise against getting the FX 9590, it is a notoriously unstable chip that many users have problems with, even with one of the few supported motherboards and extreme high end cooling. If you absolutely have to stay on AM3+, just buy one of the FX 83xx chips and overclock the hell out of it, you'd get similar performance to the 9590 for cheaper while also having a far more stable system.