Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q77 Express Processors : Intel Core i3,i5,i7 2nd & 3rd Gen, Intel Pentium Memory Support : Four (4) DIMM slots , Up to 32 GB DDR3 1600MHz Hard Drive : Up to 1TB 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) PCI LP, One (1) PCI Express x1 LP, One (1) PCI Express x16 (wired as 4) LP, One (1) PCI Express x16 LP Graphics : Intel HD Graphics Audio : HD audio with Realtek ALC221 Communications : Intel 82579LM GbE Ethernet Connection I/O Ports : Rear: (4) USB 3.0, (2) USB 2.0, Serial , Two (2) PS/2, Audio I/O, VGA, DP,RJ-45 Front: (4) USB 2.0, Audio I/O Input Devices : Standard Keyboard, Mouse (PS/2 or USB) Power : 240W Dimensions : 37.9 x 33.8 x 10 cm Weight : 7.6 kg