Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q67 Processors : Intel Core i5,i7 2nd Gen Memory Support : Four (4) DIMM slots , Up to 16 GB DDR3 SDRAM 1333MHz Hard Drive : Up to 350 GB 7200 rpm Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays :External: One (1) 5.25-inch, One (1) 3.5-inch, Internal: One (1) 3.5-inch Expansion Slots :One (1) LP PCI Express x16, One (1) LP 32-bit PCI 2.3, One (1) LP PCI Express x1 Graphics :Intel HD Graphics Audio :High Definition (HD) Audio, Realtek ALC662 codec Communications :Intel 82579 GbE Network Connection I/O Ports : Front: Two (2) USB, Audio I/O  Rear: Six (6) USB, VGA, DP, Serial, Audio I/O Input Devices : Standard Keyboard, Mouse (USB) Power :240 W Dimensions : 36.9 cm x 33.7 cm x 9.9 cm Weight :7.5 kg