I just played around a bit with my OC settings, since I got some crashes from time to time. Now I concentrated for the Vcore setting for my Q6600 G0, which is targeted to run @ 3,6 GHz (9x400 MHz).
Mainboard would be XFX 780i with P03 BIOS. In BIOS, I set the Vcore to 1.4v and booted...