Lenovo ThinkCentre A57, 2.53 GHz, Intel® Core™2 Duo, 2 GB, 320 GB, DVD±RW, Windows Vista Business Lenovo ThinkCentre A57. Processor frequency: 2.53 GHz, Processor family: Intel® Core™2 Duo, Processor model: E7200. Internal memory: 2 GB, Internal memory type: DDR2-SDRAM. Total storage capacity: 320 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: 11 kg