Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q77 Processors : Intel Core i3,i5,i7 3rd Gen, Intel Pentium Memory Support : Four (4) DIMM slots , Up to 32 GB DDR3 1600 MHz SDRAM  Hard Drive : Up to 1 TB 7200 rpm Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays : External: Three (3) 5.25-inch, Internal: Three (3) 3.5-inch Expansion Slots : One (1) LP PCI , One (1) LP PCI-E x1, Two (2) LP PCI-E x16 Graphics : Intel HD Graphics: Basic, 2000, 2500, 4000 Audio : Realtek ALC221 codec Communications : Intel 82579LM integrated GbE Network Connection I/O Ports : Front: Four (4) USB 2.0, Audio I/O, Rear: Four (4) USB 3.0, Two (2) USB 2.0,Serial, VGA, DP, RJ-45, Audio I/O, Two (2) PS/2 Input Devices : Standard Keyboard, Mouse (USB or PS/2) Power : 320 W Dimensions : 44.8 x 44.5 x 17.8 cm Weight : 11.2 kg