HP Compaq Pro 3500 Microtower Desktop PC - C7A34UT Microtower Desktop Windows 7 Professional 64 (available through downgrade rights from Windows 8 Pro) Intel Core i5-3470 with Intel HD Graphics 2500 (3.20 GHz, 6 MB cache, 4 cores) 4GB DDR3 1333 MHz SDRAM 500GB 7200RPM SATA 3.0Gb/s Hard Drive