Dell OptiPlex 990 SFF Desktop PC Intel Core i5-2400 3.1GHz /4G/250G/Win 7 Pro Intel Core i5-2400 Processor ( 6MB Cache, 3.1GHz, 4 Cores ) 4GB DDR3 / 250GB SATA HDD Windows 7 Professional Licence included and Fully installed with Service Pack 1 Free Brand NEW USB Mouse&USB Keyboard Free 180 days Warranty