Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q87 Processors : Intel Core i3, i5, i7 4th Gen Memory Support : Four (4) DIMM slots , Up to 16 GB DDR3 Hard Drive : SATA up to 1TB HDD or SSD Removable Media : DVD-ROM/DVD-RW Expansion Bays : External : Two (2) 5.25-inch , Internal: Two (2) 3.5-inch Expansion Slots : One (1) PCIe x16, One (1) PCIe x 16(wired x 4), One (1) PCIe x 1, One (1) PCI Graphics : Intel HD Graphics Audio : Integrated Audio Communications : Intel I217LM Gigabit Ethernet Port I/O Ports : Front: Two (2) USB 3.0 , Two (2) USB 2.0, Audio I/O  Rear: Two (2) USB 3.0, Four (4) USB 2.0, VGA, Two (2) DP, RJ-45, Serial, Two (2) PS/2, Audio I/O Input Devices : Standard Keyboard, Mouse (USB or PS/2) Power : 290W Dimensions : 41.7 x 36 x 17.5 cm Weight : 9.4 kg