HP Compaq Pro 6300 All-in-One PC (ENERGY STAR). Processor model: Intel Core i5-3470S with Intel HD Graphics 2500 (2.9 GHz, 6 MB cache, 4 cores). Memory slots: 2x SO-DIMM. Discrete graphics adapter model: Intel HD Graphics 2500. Operating system installed: Windows 7 Professional 64 (available through downgrade rights from Windows 8 Pro 64). Optical drive type: Slim Tray-load SuperMulti DVD writer