HP 420, Z. Processor clock speed: 3600 MHz, Processor family: Intel Xeon, Processor model: E5-1620. Internal memory: 8192 MB, Internal memory type: DDR3, Memory slots: 8x 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 This is an auto-generated long summary based on the first three features of the first five feature groups.