Lenovo ThinkCentre E73 SFF (10AU002PUS) Intel Core i3-4130 3.40 GHz, 4GB DDR3, 500GB HDD, Intel HD Graphics, Windows 7 Pro Intel Core i3-4130 3.40 GHz 4GB DDR3 RAM, 500GB HDD Intel HD Graphics 4400 DVD-RW Optical Drive, Keyboard and Mouse, Silver Windows 7 Pro 64 bit Operating System