Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q45 Processors : Intel Core 2 Duo, Core 2 Quad, Dual Core & Celeron Memory Support : Four (4) DIMM slots , Up to 16 GB DDR2 SDRAM  Hard Drive : Up to 250GB at 7200RPM 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 : (1) LP PCI, (1) LP PCI Express x1, (2) LP PCI Express x16 Graphics : Intel GMA 4500 Audio : Integrated HD audio with AD1884A codec Communications : Integrated Intel 82567LM GbE Network Connection I/O Ports : Front: Two (2) USB, Audio I/O, Rear: Six (6) USB 2.0, Serial, VGA, DP, RJ-45, Audio I/O, PS/2 Input Devices : Standard Keyboard, Mouse (PS/2 or USB) Power : 240 W Dimensions : 37.8 cm x 337.8 cm x 10 cm Weight : 8.50 kg