Legacy Intel® Core™ Processor Intel Core i3-2xxx Lenovo ThinkCentre M81, 3.1 GHz, Intel® Core™ i3, 2 GB, 320 GB, DVD-RW, Windows 7 Professional Lenovo ThinkCentre M81. Processor frequency: 3.1 GHz, Processor family: Intel® Core™ i3, Processor model: i3-2100. Internal memory: 2 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1333 MHz. Total storage capacity: 320 GB, Optical drive type: DVD-RW. On-board graphics card model: Intel® HD Graphics 2000. Operating system installed: Windows 7 Professional, Operating system architecture: 64-bit. Power supply: 280 W. Chassis type: Tower. Product type: PC. Product color: Black