HP 6005 Pro MT, Compaq Pro. Processor clock speed: 3.2 GHz, Processor family: AMD Athlon II X4. Internal memory: 4 GB, Maximum internal memory: 16 GB, Internal memory type: DDR3-SDRAM. Total storage capacity: 500 GB, Hard drive rotational speed: 7200 RPM, Hard drive interface: Serial ATA. Discrete graphics adapter model: AMD Radeon HD 4200. Operating system installed: Windows 7 Professional, Operating system architecture: 64-bit