This article from AnnandTech is a good back-drop. Essentially, Nehalem will be both faster and more efficient at processing data, especially in systems with four or eight cores. So while the current 8-way Mac Pro is a screamer, the Nehalem 8-way will comprehensively outperform it.
Oooooooh! Thanks a lot it makes a bit more sense now! hehe, I think I mite wait until then! Also gives me a bit more time to save up! hehe Thanks