Sorry to hear about the P5B, but look at it as a gift in disguise...

You have a MAX now, which should net you some really good overclocking! I found a beta, BIOS 13, on ABIT's website forum, gimme a sec...
http://forum.abit-usa.com/showthread.php?t=114150
It adds the tRFC (<I think that's what it is, tRef, whatever...)(I'm on my work pc, 'slow crap' is too good for describing it) to the BIOS RAM section, on the bottom, which helped me get past the 400FSB barrier; but like I posted elsewhere in OC3D, it's a setting that takes a lot of patience. Too high and all the FSB-jacking won't mean squat, too low and your pc won't start up (refer to the advice given before on resetting your BIOS). I use 30 as my tRFC.
I'll give you a short example: at 390FSB*9ExtClk=3.51GHz,RAM@533MHz(1:1)w/tRFC28(I believe that's the default), my 3dmark06 score was 9469 (or 9649, listed as FTASM-Interceptor)...
With a tRFC of 38 and a clock speed of 3.6GHz (400FSB*9), my 3dmark06 score would end up being about 20 points less! When I backed down to 30 tRFC, my scores would finally take advantage of the higher clock speed.
Good luck with the new board, dude...!
TJS