Operating System : Windows 7 Home & Pro. MAR, Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel H61 Processors : 2nd & 3rd generation Intel Core i3, Intel Core i5, Intel Core i7, Intel Pentium Memory Support : Two (2) DIMM slots , Up to 16 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, One (1) 3.5-inch, Internal: Two (2) 3.5-inch Expansion Slots : One (1) PCI-e 3.0 x16, Two (2) PCI-e x1, One (1) PCI Graphics : Intel HD Graphics Audio : Realtek ALC663 Communications : 10/100/1000 MBit/s Realtek RTL 8111E I/O Ports : Six (6) USB 2.0 (2 front, 6 rear), VGA, DVI-D, Two (2) PS/2, RJ-45, Audio I/O Input Devices : KBPC PX ECO, Mouse M440 ECO Power : 280 watts 86% active PFC Dimensions : 175 x 425 x 353 mm Weight : 9 kg