Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel H61 Processors : Intel Core i3,i5 2nd & Intel Core i3,i5,i7 3rd Gen. Intel Pentium, Intel Celeron Memory Support : Two (2) DIMM slots , Up to 16GB DDR3 1600MHz Hard Drive : SATA 3.0Gb/s 7200 rpm Removable Media : DVD-ROM/DVD Recordable Expansion Bays : External: One (1) 5.25-inch, One (1) 1.5-inch Internal: One (1) 3.5-inch Expansion Slots : Two (2) FH PCI-E x1, One (1) PCI x16 Graphics : Intel HD Graphics Audio : High Definition (HD) Audio, Realtek ALC662 codec Communications : Realtek RTL8111E GbE Network Connection I/O Ports : Front: Two (2) USB 2.0, Audio I/O, Rear: Four (4) USB 2.0, VGA, DVI, RJ-45, Audio I/O Input Devices : Standard Keyboard, Mouse (USB) Power : 180W Dimensions : 38.2 x 33.6 x 10.1 cm Weight : 6 kg