The new Mac Pros fit up to two (Westmere) 4-core Xeon processors, sure, but if you've got the inclination, you can load up on dual 6-core Intel Xeon processors, or 12 cores of power. As for the design? That's unchanged.In simpler-speak, the big update is that the Mac Pro shifted from 45nm Nahalem processors (other than in the $2,500 base model) to 32 nm Westmere processors. Those holding out on the processor generation jump to buy a new Mac Pro, it looks like that time has come.

The new Mac Pro is the most powerful and configurable Mac we've ever made," said Philip Schiller, Apple's senior vice president of Worldwide Product Marketing. "With up to 12 cores, the new Mac Pro outperforms our previous top-of-the-line system by up to 50 percent, and with over a billion possible configurations, our customers can create exactly the system they want."

At the heart of the new Mac Pro's performance are next generation quad-core and 6-core Intel Xeon processors running at speeds up to 3.33 GHz. These multi-core processors use a single die design so each core can share up to 12MB L3 cache to improve efficiency while increasing processing speed. These systems feature an integrated memory controller for faster memory bandwidth and reduced memory latency; Turbo Boost to dynamically boost processor speeds up to 3.6 GHz; and Hyper-Threading to create up to 24 virtual cores. The Mac Pro now comes with the ATI Radeon HD 5770 graphics processor with 1GB of memory and customers can configure-to-order the even faster ATI Radeon HD 5870 with 1GB of memory.

For the first time, Mac Pro customers have the option to order a 512GB SSD for the ultimate in reliability and lightning fast performance. With the ability to install up to four SSD drives in the system's internal drive bays, the new Mac Pro can provide ultra high-speed disk bandwidth and random disk performance, two times faster than the average performance of a standard disk drive.** Mac Pro also now features two Mini DisplayPorts and one dual-link DVI port. The additional Mini DisplayPort output allows customers to connect two LED Cinema Displays without an additional graphics card or adapter and the dual-link DVI port supports legacy DVI-based displays up to a resolution of 2560 x 1600 pixels.