Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q87 Processors : Intel 4th generation Core i7 Quad Core Memory Support : Up to 4 DIMM slots. Non-ECC dual-channel 1600MHz DDR3 SDRAM, up to 32GB. Hard Drive : Up to 1TB. Supports Hybrid and Solid State Drive Removable Media : DVD+/-RW; DVD-ROM Expansion Bays : One (1) internal 3.5-inch, One (1) external 5.25-inch (SlimLine) Expansion Slots : One (1) HH PCIe x16, One (1) HH PCIe x16 (routed as x4) Graphics : Integrated Intel HD Graphics 4600 (with select CPUs) Audio : Integrated Audio Communications : Integrated Intel I217LM Ethernet LAN 10/100/1000 I/O Ports : Front: Four (4) USB, Audio I/O, Rear: Six (6) USB, VGA, DP, 2 L/I, 2 L/O, PS/2 Input Devices : Standard Keyboard Mouse (PS/2 or USB) Power : 255W Dimensions : 31.2 x 29 x 9.3 cm Weight : 6 kg