I have P5B Deluxe/WiFi that I am selling for $165 shipped. I never had the cooling to try it as high as your asking, but you can surely buy mine to try to get those speeds.
If you are interested, just let me know. (PM preferably)
EDIT: Revision 1.03G if you would need to know that.
I recently came into one of these, but for my own reasons (like...I don't enjoy running my x1950pro crossfire setup in x16/x4 modes) I may end up selling it. Retail board, but I am the second owner, so I didn't get all the parts. It's the P5B Deluxe/AP-Wifi. I'll test it tonight, if I get a chance, fiance's been sick. Bump, regardless. Settings right now:
E4300 running 9x355 = 3195, ram on 2:3 divider, for 532.5 or ddr2-1065. I'll drop the multi, and the mem divider, see if I can get it up to 600, like you're looking for. I have Buffalo Firestix, D9GKX, and I've run them over 1200, so I know if the board will do it, i can hit 600 @ 1:1.
LMAO, anyways I currently have one that is fully modded by......me It maxes at 550 FSB and RAM doesn't clock well at all either. Still a great board but want a 'golden' one