Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel C226 chipset Processors : Intel Xeon processor E3 v3 family, 4th gen Intel Core processors 4th Gen, Dual-Core Intel Pentium processors Memory Support : 4 DIMM slots, supporting up to 32GB ECC/non-ECC, DDR3 1600 MT/s Hard Drive : 500GB to 4TB SATA 3.0-Gb/s, 128GB to 1TB SSD Drives Removable Media : HP Slim DVD-ROM Drive, HP Slim SuperMulti DVDRW SATA Drive, HP Slim Blu-ray Writer Expansion Bays : External: Two (2) 5.25-inch, One (1) Slim, Internal: Two (2) 3.5-inch, Two (2) 2.5-inch Expansion Slots : 1 PCIe Gen3 x16 slot, 1 PCIe Gen2 x4 slot (x16), 1 PCIe Gen2 x4 slot, 1 PCIe Gen 2 x1 slot, 1 PCI slot Graphics : Intel Integrated Graphics Media Accelerator HD Audio : Integrated Realtek HD ALC221 Audio Communications : Integrated Intel I217LM PCIe GbE Controller I/O Ports : Front: 2 USB 2.0, 2 USB 3.0, Headphone/Mic, Rear: 4 USB 2.0, 2 USB 3.0, 2 PS2, Audio I/O, DVI-I, 2 DP Input Devices : Standard Keyboard (USB or PS/2), Mouse (USB or PS/2) Power : 400 w Dimensions : 399 x 170 x 442 mm Weight : 9.5 kg