2.8GHz Quad-Core Intel Xeon "Nehalem" processor
3GB (three 1GB DIMMs) of 1066MHz DDR3 ECC SDRAM
ATI Radeon HD 5770 with 1Gb GDDRS memory
1TB Serial ATA 7200rpm Hard Drive
18x SuperDrive with double-layer support (DVD-R/DVD-RW/CD-RW)
3x open full-length PCI Express 2.0 expansion slots
Wireless - Airport Extreme and Bluetooth
Apple Keyboard with Numeric Keypad and Magic Mouse
iLife
Mac OS X 10.6 Snow Leopard

Two 2.4GHz Quad-Core Intel Xeon "Westmere" processors
6GB (six 1GB DIMMs) of 1066MHz DDR3 ECC SDRAM
ATI Radeon HD 5770 with 1Gb GDDRS memory
1TB Serial ATA 7200rpm Hard Drive
18x SuperDrive with double-layer support (DVD-R/DVD-RW/CD-RW)
3x open full-length PCI Express 2.0 expansion slots
Wireless - Airport Extreme and Bluetooth
Apple Keyboard with Numeric Keypad and Magic Mouse
iLife
Mac OS X 10.6 Snow Leopard