Operating System : Windows 10 Pro 64, Windows 10 IoT Enterprise 2016 (LTSC) 64, FreeDOS 1.2, SuSE Linux 12 SP3 Chipset: Intel Q370 Processors : Intel Pentium G, Intel Celeron, Intel Core i3,i5,i7 8th Gen Memory Support : Four (4) SODIMM, Up to 64GB DDR4-2666 Hard Drive : SATA HDD SSD M2 Removable Storage : Optional Expansion Slots : Total of Two (2) Full-Height Slots, with a Choice of either: 1.) PCI x1 - Two (2), 2.) PCIe v3.0 x1 - Two (2), Serial PCIe x1 Full Height PCA, Total of Two (2) Half-Height: PCIe v3.0 x16 (wired as x16) - One (1), PCIe v3.0 x16 (wired as x4) - One (1), Serial PCIe x1 Low profile PCA I/O Ports : Front : Two (2) USB 3.1 Gen 1 Type A, Rear: Three (3) USB 3.1 Gen 1 Type A, Two (2) USB 2.0, Two (2) DisplayPort, One (1) RJ-45, One (1) PS/2, One (1) Headphone Communications : Intel I219-LM 10/100/1000 Integrated NIC, Intel Dual Band Wireless-AC 9260 802.11a/b/g/n/ac Dimensions : 33.71 x 38.40 x 10.0 cm Weight : 6.44 kg