Dell OptiPlex 990 Mini Tower Desktop Intel Quad Core 2nd Gen. i5-2400 3.10GHz 8GB DDR3 RAM 1TB HD DVD-RW WiFi Bluetooth Microsoft Windows 7 Professional 64-Bit Microsoft Windows 7 Professional 64-bit pre-installed w/CoA, Upgradable to Win 10Microsoft Windows 7 Professional 64-bit pre-installed w/CoA, Upgradable to Win 10 Intel Q67 Express chipset, Intel HD Graphics 2000 Intel 2nd Gen.Core i5 3.10 GHz quad-core CPU 8GB DDR3 SDRAM, 1 TB hard drive, DVD-RW WiFi, Bluetooth