Operating System : Windows 7 Home & Pro. MAR, Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel C236 Processors : Intel Xeon E3, V5-V6 Memory Support : Four (4) DIMM slots , Up to 64 GB (DDR4) ECC Hard Drive : HDD or SSD Removable Media : Optional Expansion Bays : External: Two (2) 5.25-inch, Two (2) 3.5-inch, Internal: Two (2) 3.5-inch, One (1) 2.5-inch Expansion Slots : PCI-Express 3.0 x1 , PCI-Express 3.0 x4 , PCI-Express 3.0 x16 Graphics : Intel® HD Graphics P530 Audio : Realtek ALC671 Communications : Gigabit Ethernet I/O Ports : USB 2.0 total 6, USB 3.1 Gen1 (USB 3.0) total 7, 2 x DisplayPort, 1 x DVI, PS/2, Input Devices : KBPC PX ECO, Mouse M440 ECO Power : 280W or 400W Dimensions : 180 x 304 x 375 mm Weight : approx. 12 kg