Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q45 Express Processors : Intel Core 2 Duo, Core 2 Quad, Dual Core & Celeron Memory Support : Four (4) DIMM slots , Up to 16 GB DDR3 1333 MHz SDRAM  Hard Drive : SATA Removable Media : SATA DVD-ROM drive, SATA DVD Writer Drive, SATA Blu-ray Writer Drive Expansion Bays : External: Three (3) 5.25-inch, Internal: Three (3) 3.5-inch Expansion Slots : Three (3) full height PCI, One (1) full height PCIe x1, Two (2) full height PCIe x16 Graphics : Intel GMA 4500 Graphics Audio : Realtek ALC261 HD Audio Communications : Intel 82567LM Gigabit Network Connection I/O Ports : Front: four (4) USB, microphone, headphone, Rear: six (6) USB, PS/2 keyboard and mouse, line in, line out, VGA, DisplayPort, RJ-45 Network, one (1) serial port Power : 320 W Dimensions : 447.8 x 177.8 x 444.5 mm Weight : 11.15 kg (24.54 lb)