Lenovo ThinkCentre M50, 2.8 GHz, Intel® Pentium® 4, 0.5 GB, 40 GB, DVD-ROM, Windows XP Professional Lenovo ThinkCentre M50. Processor frequency: 2.8 GHz, Processor family: Intel® Pentium® 4. Internal memory: 0.5 GB, Internal memory type: DDR-SDRAM. Total storage capacity: 40 GB, Optical drive type: DVD-ROM. Operating system installed: Windows XP Professional. Power supply: 230 W. Chassis type: Tower. Product type: PC. Weight: 10.2 kg