Lenovo ThinkCentre S50, 3.2 GHz, Intel® Pentium® 4, 0.5 GB, 40 GB, DVD-ROM, Windows XP Professional Lenovo ThinkCentre S50. Processor frequency: 3.2 GHz, Processor family: Intel® Pentium® 4. Internal memory: 0.5 GB. Total storage capacity: 40 GB, Optical drive type: DVD-ROM. Operating system installed: Windows XP Professional. Chassis type: SFF. Product type: PC. Weight: 18.3 lbs (8.3 kg)