Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel H81 Processors : Intel Core i3, i5, i7 4th Gen Memory Support : Two (2) DIMM slots , Up to 16 GB DDR3 Hard Drive : Sata 6Gb/s 7.200 rpm up to 1TB Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays : External: One (1) 5.25-inch, One (1) 1.5-inch , Internal: Two (2) 3.5-inch Expansion Slots : One (1) PCIe x 16, Two (2) PCIe x 1 Graphics : Intel HD Graphics Audio : HD Audio, Realtek ALC662 codec Communications : Gigabit ethernet, Realtek RTL8111GN I/O Ports : Front: Two (2) USB 2.0, Audio I/O  Rear: Two (2) USB 3.0, Two (2) USB 2.0, VGA, DP, RJ-45, Audio I/O Input Devices : Standard Keyboard, Mouse (USB) Power : Based on configuration Dimensions : 40 x 39.7 x 16 cm Weight : 7.5 kg