I have an E6600 running on a P5B Deluxe. At stock speed the voltage at load, using CPU-Z, shows around 1.2. If I overclock to 3Ghz, its shows 1.35v, and at 3.3Ghz it shows 1.4v+.
I have the voltage set to auto in the Bios, but I just though that meant the factory setting for the chips...