I've been an AMD user since the Athlons first came out many years ago so I've been out of the loop on the intricacies of Intel chips for quite some time. I'm looking to upgrade my current rig (see sig) to a C2D rig. While looking into CPU's I was thinking of getting either the E6700 or E6750. The E6700 is $130 more than the E6750 but the only differences I see are the FSB and voltage specs. Why is there such a price difference between these two CPU's with such seemingly minor differences?