Lenovo ThinkCentre M57, 2.2 GHz, Intel® Core™2 Duo, 1 GB, 160 GB, DVD±RW, Windows XP Professional Lenovo ThinkCentre M57. Processor frequency: 2.2 GHz, Processor family: Intel® Core™2 Duo, Processor model: E4500. Internal memory: 1 GB, Internal memory type: DDR2-SDRAM. Total storage capacity: 160 GB, Optical drive type: DVD±RW. Discrete graphics card model: Intel® GMA X3100. Operating system installed: Windows XP Professional. Power supply: 225 W. Product type: PC. Weight: 6.4 kg