OK, good news first - Phenom overclocks to 3GHz on the B2 stepping - yay! 
Now to the bad news - Performance is poor, 5 - 10% slower than C2D/C2Q.
http://news.expreview.com/2007-10-29/1193590532d6599.html
Specs:
C2D/C2Q using P35 mobo/ 8800GTX / WinXP / Forceware 169.01
Phenom X4 using RD790 mobo/ 8800GTX / WinXP / Forceware 169.01
I have to say this is pretty disappointing, having a heavily overclocked Phenom fail to match a stock C2D/C2Q. Consdering Penryns are routinely overclocking to 4GHz+ on air... things ain't looking too pretty for AMD.
Now to the bad news - Performance is poor, 5 - 10% slower than C2D/C2Q.
http://news.expreview.com/2007-10-29/1193590532d6599.html
Specs:
C2D/C2Q using P35 mobo/ 8800GTX / WinXP / Forceware 169.01
Phenom X4 using RD790 mobo/ 8800GTX / WinXP / Forceware 169.01

I have to say this is pretty disappointing, having a heavily overclocked Phenom fail to match a stock C2D/C2Q. Consdering Penryns are routinely overclocking to 4GHz+ on air... things ain't looking too pretty for AMD.