Mac Pro Quad-Core Intel Xeon 2.66GHz 3GB, 640GB

Powered by Intel's latest "Nehalem" Xeon processor and featuring a next-generation system architecture, the Apple Mac Pro desktop PC delivers up to twice the performance of its predecessor. It combines a single, hyper-threaded 2.66 GHz Quad-Core Intel Xeon 3500 series processor with a new Turbo Boost feature that automatically boosts the processor clock speed based on workload. An updated interior provides easy access to all components within the Mac Pro for hassle-free expansion and massive upgrade ability--up to 8 GB of 800 MHz RAM and four hard drive bays for up to 4 TB (that's right--terabytes) of storage under the hood. And while it comes standard with a 16x SuperDrive (compatible with burning DVD±R/RW and CD-R/RW discs), you can also add a second writing SuperDrive.