"THE NEW, LARGE LGA1366 socket for uni-CPU (Bloomfield) and dual-CPU (Gainestown) 2008 Nehalems is not just 20 per cent bigger on each side than the LGA775 for the current Penryns. It contains nearly 600 extra pins for those QPI links, three 64-bit DDR3 memory channels and, obviously, a lot of power. The larger die will be cooled by a larger heat spreader on the larger package here as well.
However, forget using any your current coolers on these new babies - all mounting holes have changed and, after all, the (extra) size does matter."
FULL STORY @ THEINQUIRER (http://www.theinquirer.net/gb/inquirer/news/2008/04/04/post-idf-notes-nehalem-cpu)