Business Desktop D3K20UT All-in-One Computer - Intel Core i3 i3-3220 3.30 GHz - Desktop Form Factor - All-in-One Desktop Operating System - Windows 7 Professional 64 (available through downgrade rights from Windows 8 Pro) Processor - Intel Core i3-3220 with Intel HD Graphics 2500 (3.3 GHz, 3 MB cache, 2 cores) Standard memory - 4GB 1600 MHz DDR3 SDRAM Internal drive - 500GB 7200 rpm SATA