HP Pro 3400 Microtower PC, Pro. Processor clock speed: 2.4 GHz, Processor family: Intel Celeron, Motherboard chipset: Intel H61. Internal memory: 2 GB, Memory slots: 2x DIMM, Internal memory type: DDR3-SDRAM. Total storage capacity: 500 GB, Hard drive capacity: 500 GB, Hard drive rotational speed: 7200 RPM. On-board graphics adapter model: Intel HD Graphics. Optical drive type: DVD Super Multi