Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel H81 Processors : Intel 4th generation Core i5 Quad Core, Core i3 Dual Core, Pentium Dual Core & Celeron Dual Core Memory Support : 2 Long DIMM slots, Non-ECC dual-channel 1600MHz DDR3 or DDR3L SDRAM, up to 16GB ram Hard Drive : Up to 1TB, Optional Solid State Hybrid Removable Media : Optional external DVD-ROM drive Expansion Bays : 2 internal 3.5, 2 external 5.25 Expansion Slots : 1 full height PCIe x16, 3 full height PCIe x1 Graphics : Integrated Intel HD Graphics 4600 (with select CPUs) Audio : N/A Communications : Integrated Realtek RTL8151GD Ethernet LAN 10/100/1000 I/O Ports : 2 external USB 3.0 ports (R),6 external USB 2.0 ports (2 F, 4 R), VGA, 1 DP 1.2, 1 Mic-in & 1 Headphone (F), 1 L/Ι & 1 L/Ο (R) Input Devices : Standard Keyboard, Mouse (USB) Power : Standard 290W Dimensions : 36.0 x 41.7 x 175 cm Weight : 9.4 kg