Originally Posted By: Dignan
Question for you good folks: How easy would you expect it to be to add a second processor to the single-CPU model? I can get a 2.66GHz Core i7 for a mere $289 on Newegg, but I don't know what kind of Apple hardware I'd need to put the chip in.

From the pictures on Apple's site, it looks like each CPU is on its own (Apple custom) daughterboard along with its RAM slots. I'd imagine these boards can't be obtained separately. Plus, normal Core i7 won't do, they need to be Core i7 Xeons (55xx) to work in two-socket machines. Plus to that plus, Apple's site says that the Core i7 Xeon in the single-CPU Mac Pros is a "3500 series" Xeon, which the Nehalem Wikipedia page hasn't even heard of, and which might potentially have had its two-socket support nobbled.

Peter