Well, because it's a rough estimate of what I'll need for my overclock. I can just about get it stable at 3.6ghz with 1.58vcore. It's a bad chip I guess. When I get watercooling though, I can try to get the Q6600 faster or might even get a 45nm quad.

This chip needs 1.4vcore to reach 3.2ghz at the moment!

EDIT - Thanks for your response mate. Appreciate it!