HP Z400 Workstation, Z. Processor family: Intel Xeon, Processor clock speed: 2.8 GHz, Processor model: W3530. Internal memory: 3 GB, Internal memory type: DDR3, Maximum internal memory: 16 GB. Hard drive capacity: 500 GB, Hard drive interface: Serial ATA, Hard drive rotational speed: 7200 RPM. Audio system: High Definition Audio. Chassis type: Minitower