Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q75 Processors : Intel Core i5 3rd Gen 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: One (1) 3.5-inch, One (1) 5.25-inch, Internal: One (1) 3.5-inch Expansion Slots : One (1) LP PCI, One (1) LP PCI Express x16, Two (2) LP PCI Express x1 Graphics : Intel HD Graphics Audio : High Definition Audio with Realtek ALC221 codec Communications : Integrated Intel 82579LM GbE I/O Ports : Four (4) USB 2.0, Audio I/O Rear: (4) USB 3.0, (2) USB 2.0, VGA, DP, RJ-45, Serial, Two (2) PS/2, Audio I/O, Front: Input Devices : Standard Keyboard, Mouse (PS/2 or USB) Power : 320 W Dimensions : 37.9 cm x 33.8 cm x 10 cm Weight : 7.6 kg (16.7 lb)