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, Max 64 GB Hard Drive :SATA or SSD 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, 1 PCIe Gen3 x4 (x4 connector), 1 PCIe Gen3 x4 (x16 connector), 1 PCIe Gen3 x1, 1 PCI (optional), 1 M.2 PCIe Gen3 x4 Graphics : Intel Integrated Graphics for Xeon processors Audio : Integrated Realtek HD ALC221-VB audio Communications : Integrated Intel I219LM PCIe GbE I/O Ports :Front: 2 USB 3.0, 2 USB 2.0 (1 charging), 1 headphone; 1 microphone, Back: 4 USB 3.0, 2 USB 2.0, 2 DisplayPort 1.2,1 DVI-I single link, 1 serial (optional); 1 parallel (optional), 2 PS/2; 1 RJ-45; 1 audio line-in; 1 audio line-out Power :400 W 92% efficient, wide-ranging, active PFC, 280 W 90% efficient, wide-ranging, active PFC Dimensions : 170 x 442 x 399 mm Weight :Starting at 8.6 kg