All these comments... everyone talking about the FX51 vs. the P$ EE.
Um, who actually buys those processors?
He's pointing to a 754 pin (single channel version), 350$ processor, not a $1000+ one.
Who cares about flagship performance except 2 or 3 people with way to much money on their hands?
And in answer to your question, it doesn't have a front side bus as it's usually defined (although fsb is an outdated term in of itself because the backside one was for external cache chips). It's memory controller operates at the same frequency as the processor, and the memory bus at 333 right now, 400 in the future if I remember correctly. The hypertransport link from the processor to the southbridge runs at 800 mhz, if you want to call that the fsb, but I wouldn't.
Tis a whole different animal here...
Sam