HP Z400 Workstation, Z. Processor family: Intel Xeon, Processor clock speed: 2.66 GHz, Processor model: W3520. Internal memory: 3 GB, Internal memory type: DDR3, Maximum internal memory: 16 GB. Hard drive capacity: 320 GB, Hard drive interface: Serial ATA, Hard drive rotational speed: 7200 RPM. Maximum graphics adapter memory: 128 MB. Optical drive type: DVD Super Multi