HP Compaq Pro 6300 Microtower Business Desktop PC - C6Z93UT Microtower Desktop Windows 7 Professional 64 (available through downgrade rights from Windows 8 Pro) Intel Core i5-3570 with Intel HD Graphics 2500 (3.40 GHz, 6 MB cache, 4 cores) 4GB 1600MHz DDR3 SDRAM 500GB 7200RPM SATA