HP Z800 Workstation Base Unit, HP Z800 1110W 89% Efficient Chassis, MS Windows 7 Professional 64-bit OS, Intel Xeon X5660 2.80 12MB/1333 6C CPU-1, Intel Xeon X5660 2.80 12MB/1333 6C CPU-2, HP 24GB(6x4GB)DDR3-1333 ECC Memory, HP No Integrated Graphics Kit,