Lenovo ThinkCentre M51, 3.2 GHz, Intel® Pentium® 4, 0.5 GB, 80 GB, DVD-ROM, Windows XP Professional Lenovo ThinkCentre M51. Processor frequency: 3.2 GHz, Processor family: Intel® Pentium® 4, Processor model: 640. Internal memory: 0.5 GB, Internal memory type: DDR2-SDRAM. Total storage capacity: 80 GB, Optical drive type: DVD-ROM. On-board graphics card model: Intel® HD Graphics, Discrete graphics card model: Intel® GMA 900. Operating system installed: Windows XP Professional. Power supply: 200 W. Product type: PC. Weight: 14.1 lbs (6.4 kg)