Lenovo ThinkCentre A51p P4 540 3.2GHz, 3.2 GHz, Intel® Pentium® 4, 0.25 GB, 80 GB, DVD-ROM, Windows XP Professional Lenovo ThinkCentre A51p P4 540 3.2GHz. Processor frequency: 3.2 GHz, Processor family: Intel® Pentium® 4. Internal memory: 0.25 GB, Internal memory type: DDR2-SDRAM. Total storage capacity: 80 GB, Optical drive type: DVD-ROM. Discrete graphics card model: Intel® GMA 900. Operating system installed: Windows XP Professional. Power supply: 310 W. Chassis type: Desktop. Product type: PC. Weight: 30.9 lbs (14 kg)