Operating System: Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset: Intel Q65 Processors: Intel Core i3, i5, i7 2nd Gen, Intel Pentium G620, G840 Memory Support: Four (4) DIMM slots , Up to 16 GB DDR3 Hard Drive: SATA 7.200/10.000 rpm or SSD Removable Media: DVD-ROM/DVD Recordable Expansion Bays: External: One (1) 5.25-inch, One (1) 3.5-inch, Internal: Two (2) 3.5-inch Expansion Slots: One (1) PCI-e x16, One (1) PCI-e x1 , Two (2) PCI slotm Graphics: Intel HD Graphics Audio: Integrated Audio, ALC662 chipset Communications: Intel 82579, 10M/100M/1000M Gigabit Ethernet I/O Ports: Front: Two (2) USB 2.0, microphone, Audio I/O Rear: Six (6) USB 2.0, VGA, DP, RJ-45, Audio I/O, Two (2) PS/2 Input Devices: Standard Keyboard, Mouse (USB or PS/2) Power: Depends on Model Dimensions: 44.2 x 41.4 x 17.5 cm Weight: N/A