Lenovo ThinkCentre M55p, 1.86 GHz, Intel® Core™2 Duo, 1 GB, 250 GB, DVD±RW, Windows XP Professional Lenovo ThinkCentre M55p. Processor frequency: 1.86 GHz, Processor family: Intel® Core™2 Duo, Processor model: E6300. Internal memory: 1 GB, Internal memory type: DDR2-SDRAM. Total storage capacity: 250 GB, Optical drive type: DVD±RW. Discrete graphics card model: Intel® GMA 3000. Operating system installed: Windows XP Professional. Power supply: 225 W. Chassis type: SFF. Product type: PC. Weight: 8.5 kg