In my opinion the T7600 is way overpriced for the advantage over a T7200 and the T7200 go for much less. Any c2d is overkill for the car unless you are like me and use high end programs in the car.
Also I should clarify in the posts above when I say "nothing happened" what I mean is the LEDs (2 red ones for some reason) light up and the cpu fan spins. My HD spins up and everything. However, the screen is never awakened, no beep is heard, HD never starts to seek, just the initial spin up then dead, nothing. So it is a powered nothing. That is what led me to believe CPU problems because that is exactly what happened to me on that same 6800 SLI computer. The P4EE was brand new ($1200 for the 3.2Ghz I think) and all the motherboard BIOS's were not yet setup for the P4EE except the newest ones. And when you order, you usually get the oldest board they have so they can rotate stock, so the board wouldn't POST either until I put in a not-so-old-at-the-time P4 HT and booted it up, flashed the BIOS and put in the P4EE again. That is also one of the reasons why I bought a Core Duo instead of the Core 2 Duo the second time to rule out BIOS being old.