Dell OptiPlex 990 SFF Desktop Intel Quad-Core i5 2400 3.10 GHz 16GB DDR3 RAM 1TB HD DVDRW WiFi Bluetooth Windows 7 Professional 64-Bit Microsoft Windows 7 Professional 64-Bit pre-installed w/CoA Intel Core i5-2400 3.10 GHz quad-core CPU Intel Q67 Express chip, Intel HD Graphics 2000 16 GB DDR3 SDRAM, 1 TB hard drive, DVD-RW drive WiFi USB, Bluetooth USB