Dell Optiplex 990 Small form factor desktop PC 3.1GHz 2nd generation (Sandybridge) Intel Core i5-2400 Quad Core CPU with Turbo-Boost (3.4GHZ) 6MB L3 Cache 4GB DDR3 Ram 320 GB 7200k Hard Drive (SATA) 128MB On-Board Video Card 2 expandable PCI Express slots 10 USB 3.0 ports High Definition Sound Card Windows 7 Profesional with valid serial New keyboard and mouse