The standard-configuration 12-core Mac Pro features two 2.4 gigahertz 6-core Intel Xeon E5645 processors and 12 megabytes of fully shared L3 cache per processor. The 12-core model starts at $3,799 with 12 gigabytes of memory, a 1-terabyte hard drive and ATI Radeon HD 5770 graphics with 1 gigabyte of GDDR5 memory.
The quad-core Mac Pro features one 3.2 gigahertz quad-core Intel Xeon processor and 6 gigabytes of memory. It also features a 1-terabyte hard drive and ATI Radeon HD 5770 with 1 gigabyte of GDDR5 for $2,499.
A Mac Pro server configuration is also available, featuring one 3.2 gigahertz quad-core Intel Xeon processor and 8 gigabytes of RAM standard. For $2,999 it features two 1-terabyte hard drives, the ATI Radeon HD 5770 with 1 gigabyte of GDDR5 RAM, and it comes installed with OS X Lion Server.
Update: An earlier version of this article described the new 12-core Mac Pro chip as the "Xeon E5," but the Xeon E5645 found in the workstation is actually a two-year-old Westmere-EP chip.