Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel B75 Processors : Intel 3rd gen Core i7 Quad Core, i5 Quad Core, i3 Dual Core and Pentium Dual Core Memory Support : Four (4) DIMM slots , Up to 32 GB DDR3, unbuffered, non-ECC, 1600 MHz, PC3-12800 Hard Drive : Serial ATA II 160 / 250 / 500 GB/ 1 TB/ 2 TB, SSD SATA, 256 GB, 2.5-inch Removable Media : DVD-ROM, DVD Super Multi, BD Triple Writer SATA slim (tray) Expansion Bays : External: One (1) 5.25-inch, One (1) 3.5-inch, Internal: One (1) 3.5-inch Expansion Slots : One (1) LP PCI-e 3.0 x16, Two (2) LP PCI-e x1, One (1) LP PCI Graphics : Intel® HD Graphics, HD Graphics 2000, HD Graphics 2500, HD Graphics 4000 (depending on CPU) Audio : Conexant CX20642 Communications : 10/100/1000 MBit/s Realtek RTL 8111E I/O Ports : Front: 2 x USB 2.0, Audio I/O  Rear: 4 x USB 2.0, 2 x USB 3.0, Audio I/O, VGA, DVI Input Devices : KBPC PX ECO, Mouse M440 ECO Power : 280W 85% efficient, Active PFC Dimensions : 340 x 382 x 98 mm Weight : 10 kg