Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q77 Processors : Intel Core i7 3rd Gen Memory Support : Four (4) DIMM slots , Up to 32 GB DDR3 1600MHz Hard Drive : SATA III, 7.200rpm up to 1TB or SSD up to 256GB Removable Media : SATA DVD-ROM drive, SATA DVD Writer Drive, SATA Blu-ray Writer Drive 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 Power : 240W Dimensions : 37.9 x 33.8 x 10 cm Weight : 7.6 kg