HP Z400 Workstation, Z. Processor family: Intel Xeon, Processor clock speed: 3.06 GHz, Processor model: W3550. Internal memory: 6 GB, Internal memory type: DDR3, Memory slots: 6x DIMM. Hard drive capacity: 1000 GB, Hard drive interface: Serial ATA, Hard drive rotational speed: 7200 RPM. Optical drive type: DVD Super Multi. Audio system: HD Audio