Operating System: Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset: Intel G45S Express Chipset Processors: Intel Core 2 Duo, Core 2 Quad, Celeron & Pentium Memory Support: Four (4) DIMM slots , Up to 8 GB DDR3 1066/1333MHz Hard Drive : Up to 1 TB 7200rpm or SSD Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays : External: One (1) 3.5-inch, One (1) 5.25-inch, Internal: One (1) 3.5-inch Expansion Slots : N/A Graphics : Intel GMA Audio : Realtek ALC662 HD Audio Communications : Realtek 8111DL GbE Ethernet Controller I/O Ports : Front: Two (2) USB 2.0, Audio I/O Rear: Six (6) USB 2.0, VGA, DVI, RJ-45, Serial, Audio I/O, PS/2 Input Devices : Standard Keyboard, Mouse (USB or PS/2) Power : 250 W Dimensions : 101 x 339 x 387 mm Weight : 6.76 kg