ASUS Essentio CM 1630: 2.8 GHz AMD Athlon II X2 220, 4GB RAM, 500GB HDD, On-Board 5.1 audio, optical audio port and HDMI, 64-bit Windows 7 Professional. ASUS Essentio CM 1630: 2.8 GHz AMD Athlon II X2 220, 4GB RAM, 500GB HDD, On-Board 5.1 audio, optical audio port and HDMI, 64-bit Windows 7 Professional.