Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset :Intel C612 Processors :Intel Xeon Processors: E5-1600 v3/v4 family (4C/6C/8C), E5-2600 v3 family (8C) Memory Support :8 DIMM Slots for DDR4 ECC Registered Memory Hard Drive :500GB to 4TB SATA 3.0-Gb/s, 128GB to 1TB SSD Drives Removable Media :16X DVD-ROM SATA Drive, 16X DVD+/-RW SuperMulti SATA Drive, Blu-ray Writer Expansion Bays :External: Two (2) 5.25-inch, Internal: Two (2) 3.5-inch Expansion Slots :2 PCIe x16 Gen3 Slots, 1 PCIe x8 Gen 3, 1 PCIe x1 Gen 2, 1 PCIe x4 Gen 2, 1 PCI Slot Graphics :N/A Audio :Integrated Intel/Realtek HD ALC262 Audio Communications :Integrated Intel I218LM PCIe GbE Controlle I/O Ports :Front: Four (4) USB 3.0, Headphone/Mic, Rear: Two (2) USB 2.0, Four (4) USB 3.0, 2 PS2, Audio I/O Power :525W or 700W Dimensions :43.2 x 16.8 x 45.6 cm Weight :13.5 kg