Great like always NewBeetle-san...
I was trying this evening my E8500 on my 665 fsb P5K but i think Wolfdale are pretty limited on p35 due to high frequency and high fsb togheter...
Wolfy don't like so much Pll like conroes, so it's difficult push them up with high frequency.
Atm after a fast run i'm at 5880Mhz 1.86v... i hope to try it on some great 965's mobo or try to cool p5k Nb around -10° and similar...have you tried with your p5k?