Dell OptiPlex 990 Mini Tower Desktop Intel Quad Core 2nd Gen. i5-2400 3.10GHz 16GB DDR3 RAM 256GB SSD DVD-RW WiFi Bluetooth Microsoft Windows 7 Professional 64-Bit Microsoft Windows 7 Professional 64-bit pre-installed w/CoA, Upgradable to Win 10 Intel Q67 Express Chipset Intel 2nd Gen.Core i5 3.10 GHz quad-core CPU 16GB DDR3 SDRAM, 256GB SSD, DVD-RW WiFi, Bluetooth