Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel H81 Processors : Intel 4th Gen Core i3,i5,i7, Intel Pentium Memory Support : Two (2) DIMM slots , Up to 16 GB DDR3, 1600MHz Hard Drive : SATA3 HDD or SSD Removable Media : DVD-ROM/DVD-RW Expansion Bays : N/A Expansion Slots : One (1) x PCI Express 2.0 x16 (LP), One (1) x PCI Express 2.0 x1 (LP) Graphics : Intel Graphics Media Accelerator HD Audio : Realtek? ALC887 HD Audio Communications : Realtek RTL8111G Gigabit Ethernet Controller I/O Ports : 4 x USB 2.0, 2 x USB 3.0, DVI-D, VGA, 2 x PS/2, RJ-45 Input Devices : Standard Keyboard, Mouse (USB) Power : N/A Dimensions : N/A Weight : N/A