Later this year Intel will be introducing pin compatible upgrades to its Core 2 and Xeon lines, except instead of two cores these processors will feature four. Codenamed Kenstfield (Core 2) and Clovertown (Xeon), Intel's new quad-core processors will dramatically increase the amount of processing power you can have in a single system. Given that the Mac Pro features two LGA-771 sockets, you could theoretically drop two Clovertown processors in there and you'd have an 8-core Mac Pro.