YOU said it can, but can it? As darkbreeze said, what board is it? Again, if it's a 915 or 925 chipset board, it CAN'T support a C2Q. You voted down my answer and you don't even know what a C2Q is? It's a Core 2 Quad, or a quad core CPU. But just telling us it's a S775 DOESN'T mean it can support a quad core. 925 board? No support. First gen 945 board? No support. Nforce590? Socket 775, but no 65nm quad core support. Just because it's a S775 DOES NOT mean it can support a quad core CPU. You can vote my posts down all you want, but it's not going to change that simple fact.
I even finished my post by listing chips that MIGHT run in your board. Instead of being mad at me, why don't you go look for one.