HP Business Desktop D8C26UT Desktop Computer - Intel Core i7 i7-3770 3.40 GHz - Convertible Mini-t - Convertible Minitower Form Factor Windows 7 Professional 64 (available through downgrade rights from Windows 8 Pro) Intel Core i7-3770 with Intel HD Graphics 4000 (3.4 GHz, 8 MB cache, 4 cores) 4GB 1600 MHz DDR3 SDRAM 500GB 7200RPM SATA Hard Drive