Lenovo ThinkCentre A53, 3.06 GHz, Intel® Pentium® 4, 0.5 GB, 80 GB, DVD-ROM, Windows XP Professional Lenovo ThinkCentre A53. Processor frequency: 3.06 GHz, Processor family: Intel® Pentium® 4, Processor model: 524. Internal memory: 0.5 GB, Internal memory type: DDR2-SDRAM, Memory clock speed: 533 MHz. Total storage capacity: 80 GB, Optical drive type: DVD-ROM. Discrete graphics card model: Intel® GMA. Operating system installed: Windows XP Professional. Power supply: 250 W. Chassis type: Tower. Product type: PC. Weight: 24 lbs (10.9 kg). Product color: Black