This is the second time I have seen you mention this. Do you realize that C2D and C2Q chips use an ENTIRELY different socket than the i7 series chips?
C2D and C2Q use LGA775
i7 920, 930 use LGA1366
i7 860, i5s, and i3s use LGA1156
You can't just take any board and throw any chip on it!
That's why I said: "If your Mobo supports it"