Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel H61 Processors : Intel Core i5 2nd Gen Memory Support : Two (2) DIMM slots , Up to 8 GB DDR3 1333 MHz Hard Drive : Sata II 7.200 rpm up to 1TB Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays : External: Two (2) 5.25-inch, Internal: Two (2) 3.5-inch Expansion Slots : Three (3) PCIe x1, One (1) PCIe x16 Graphics : Intel HD Graphics Audio : Conexant CX20641 High Definition Audio Codec Communications : Integrated Realtek LOM I/O Ports : Front: Two (2) USB 2.0, Audio I/O, Rear: Six (6) USB 2.0, RJ-45, VGA, HDMI, Audio I/O Input Devices : Standard Keyboard, Mouse (USB) Power : 265W Dimensions : 41.7 x 36 x 17.5 cm Weight : 8.87 kg