Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q85 Processors : Intel 4th Gen Core i3,i5,i7 Memory Support : Four (4) DIMM slots , Up to 32 GB DDR3 1600MHz Hard Drive : Up to 2T 7.200rpm or SSD 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 3.0 x16, One (1) LP PCIe 2.0 x1, One (1) LP PCIe 2.0 x16 Graphics : Intel HD Graphics Audio : High Definition (HD) Audio, Realtek ALC662 codec Communications : Intel I217-LM GbE Network Connection I/O Ports : Front: Two (2) USB 3.0 , Audio I/O  Rear: Two (2) USB 3.0, Four (4) USB 2.0, VGA, Two (2) DP, RJ-45, Serial, Audio I/O, parallel 25-pin (optional) Input Devices : Standard Keyboard, Mouse (USB) Power : 240 W Dimensions : 37.5 x 33.8 x 10.2 cm Weight : 7.8 kg