Operating System : Windows 7 Home & Pro. MAR, Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q77 Processors : 2nd & 3rd generation Intel Core i3, Intel Core i5, Intel Core i7, Intel Pentium Memory Support : Four (4) DIMM slots , Up to 32 GB DDR3, unbuffered, non-ECC, 1600 MHz, PC3-12800 Hard Drive : HDD SATA III up to 2GB 3.5" 7200 rpm, SSD SATA III up to 256GB 2.5" Removable Media : DVD-ROM, DVD Super Multi, BD Triple Writer SATA slim (tray) Expansion Bays : External: Two (2) 5.25-inch, Two (2) 3.5-inch, Internal: Two (2) 3.5-inch, One (1) 2.5-inch Expansion Slots : One (1) PCI-e 3.0 x16, One (1) PCI-e 2.0 x4, One (1) PCI-e x1, One (1) 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 Intel® 82579 V I/O Ports : Front: 2 x USB 3.0, 2 x USB 2.0, Audio I/O  Rear: 2 x USB 3.0, 6 x USB 2.0, PS2, Serial, Audio I/O, DVI, DP Input Devices : KBPC PX ECO, Mouse M440 ECO Power : 280 watts 88% active PFC Dimensions : 175 x 419 x 395 mm Weight : 11 kg