Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q65 Express Processors : Intel Core i3,i5,i7 2nd Gen Memory Support : Four (4) DIMM slots , Up to 16 GB DDR3 1333 MHz SDRAM  Hard Drive : Up to 3TB 7200 rpm or Solid State Drive (optional) Removable Media : SATA DVD-ROM drive, SATA DVD Writer Drive, SATA Combo Drive CD-RW (Slim-Line) Expansion Bays : External: One (1) 5.25-inch (Slim-Line), Internal: One (1) 3.5-inch Expansion Slots : One (1) PCIe x16, One (1) PCIe x16 (wired x4) (LP) Graphics : Intel HD Graphics 2000 Audio : Realtek ALC269Q High Definition Audio Codec Communications : Intel 82579LM Gigabit Ethernet I/O Ports : Front: Four (4) USB, microphone, headphone, Rear: Six (6) USB, Serial, VGA, DP, Stereo line in, Speakers line out, PS/2 Input Devices : Standard Keyboard (USB or PS/2) Power : 240W Dimensions : 31.2 x 29.0 x 9.26 cm Weight : 5.70 kg