Dell Inspiron i3847 Desktop Computer - (Windows 7 Pro, Intel Quad-Core i7-4790 Processor 3.6GHz, 16GB Memory, 2TB Hard Drive, DVD Drive) Intel Core i7-4790 Processor 3.6GHz up to 4.0GHz Turbo Frequency, 8MB Cache , 16GB DDR3 (8GBx2 1600MHz), 2TB 7200 rpm Hard Drive Intel HD Graphics, Tray load DVD Drive (Reads and Writes to DVD/CD), 2 USB 3.0, 4 USB 2.0, HDMI DW 1705 802.11bgn + Bluetooth 4.0, 2.4 GHz, 1x1, Integrated 5.1 Audio, Inspiron 3847 Chassiss, MT, Black w/8:1 media card reader, Dell KB113 Wired Keyboard, Dell MS111 USB 3-Button Optical Mouse Windows 7 Professional, 64Bit, English. Best Operation System for Business and Home Use. Windows 8.1 Pro disk also included in the package.