**UPDATE**
Since my last clock failed after 7 hours I thought I'd better post an update, upped the fsb by 1 for a bit of clarity too so now at 501x8 = 4009mhz 8 hrs stable and counting

http://valid.x86-secret.com/show_oc.php?id=247940

CPU : Q6600 G0
Week : L23B010
Clockspeed : 501x8 = 4009mhz
Cooling : D-Tek fuzion
Vcore : 1.64
Motherboard : Asus Blitz Formula