Lenovo ThinkCentre M57, 2.66 GHz, Intel® Core™2 Duo, 2 GB, 250 GB, DVD-RW, Windows Vista Business Lenovo ThinkCentre M57. Processor frequency: 2.66 GHz, Processor family: Intel® Core™2 Duo, Processor model: E6750. Internal memory: 2 GB, Internal memory type: DDR2-SDRAM. Total storage capacity: 250 GB, Optical drive type: DVD-RW. Discrete graphics card model: Intel® GMA 3100. Operating system installed: Windows Vista Business. Power supply: 280 W. Chassis type: Tower. Product type: PC. Weight: 10.2 kg. Product colour: Black