Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset :Intel PCH C236 Processors :Core i3/i5/i7-6xxx processors, Xeon E3 processors Memory Support :4 DDR4 memory slots, DDR4, UDIMM (unbuffered), ECC and non-ECC, 2133MT/s DDR4, Max 64 GB Hard Drive :500GB to 4TB SATA 3.0-Gb/s, 128GB to 1TB SSD Drives Removable Media : N/A Expansion Bays : 1 shared internal/external 3.5" bay, 1 internal 3.5" bay, 1 internal 2.5" bay (for SSD only) Expansion Slots : 1 PCIe Gen3 x16 slot, 1 PCIe Gen3 x4 slot (x16), 2 PCIe Gen3 x1 slot Graphics : Intel HD Graphics 530 (on Core i3/i5/i7-6xxx processors); Intel Integrated Graphics for Xeon processors Audio :Integrated HD Audio Communications : Integrated Intel I219LM PCIe GbE Controller I/O Ports :Front: 2 USB 2.0, 2 USB 3.0, Headphone/Mic, Rear: 6 USB 3.0, 2 PS2, 1 Serial, Audio I/O, 3 DP Input Devices :Standard Keyboard (USB or PS/2), Mouse (USB or PS/2) Power :240W, 92% efficiency, wide-ranging, active PFC Power Supply Dimensions : 100 x 338 x 381 mm Weight :6,7 kg