Hard Drive HDD HP Pro 3135 MT, 3 GHz, AMD Athlon II X2, 2 GB, 320 GB, DVD Super Multi, Windows 7 Professional HP Pro 3135 MT. Processor frequency: 3 GHz, Processor family: AMD Athlon II X2, Processor model: 250. Internal memory: 2 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1333 MHz. Total storage capacity: 320 GB, Storage media: HDD, Optical drive type: DVD Super Multi. Operating system installed: Windows 7 Professional, Operating system architecture: 64-bit. Power supply: 300 W. Chassis type: Micro Tower. Product type: PC. Product colour: Black