Operating System : Windows 10 Home & Pro MAR Chipset : Intel Q67 Processors : Intel 2nd Generation Core i7, i5, i3 Processors Memory Support : Four (4) DIMM slots, DDR3, Up to 16 GB, 1333 MHz Hard Drive : Up to 2 TB 7.200 rpm SATA or SSD (Optional) Removable Media : DVD-ROM/DVD Recorder Expansion Bays : External: One (1) 5.25-inch, Internal: One (1) 3.5-inch Expansion Slots : One (1) PCIe x 16 HH, One (1) PCIe x 16 (wired x 4) HH, Two (2) PCI Slots, One (1) PCIe x 1 HH, One (1) PCI HH Graphics : Integrated Intel HD Graphics 2000 Audio : Integrated HD Audio Communications : Integrated Intel 82579LM GbE Ethernet Controller  I/O Ports : Front: Four (4) USB 2.0, Audio I/O, Rear: Five (5) USB 2.0, Two (2) USB 2.0, DP, VGA, RJ-45, Audio I/O, PS/2. Internal: One (1) USB 2.0 Input Devices : Standard Keyboard, Mouse ( PS/2 or USB) Power : 250W Dimensions : 41.0 x 14.2 x 4.0 cm Weight : 9 kg