Operating System : Windows 10 Home & Pro MAR Chipset : Intel Q150 Processors : Intel 6th gen Core i7 Quad Core, i5 Quad Core and i3 Dual Core Memory Support : Four (4) DIMM slots , Up to 64 GB DDR4-2133 SDRAM Hard Drive : Serial ATA III up to 4 Gb, SSD up to 512 Gb, SSHD up to 1 Tb Removable Media : Slim Optical Drive (optional) Expansion Bays : External: One slim ODD, Internal: 2 8,9 cm (3.5") Expansion Slots : 1 PCI Express x16, 3 PCI Express x1 Graphics : Intel HD Graphics Audio : Realtek ALC221 Communications : Intel I219LM Gigabit Network Connection LOM I/O Ports : Front: 2 USB 2,0, 2 USB 3.0, Audio I/O, Rear: 2 USB 2.0, 4 USB 3.0, Audio I/O, VGA, 2 DisplayPort, RJ45, 2 PS/2, Serial Input Devices : HP USB Slim Business Keyboard(N3R87AA) HP USB Optical Scroll Mouse(QY777AA) Power : N/A Dimensions : 170 x 355 x 358.3 mm Weight : 7.35kg