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: Two 8,9 cm (3.5"); One 6,35 cm (2.5’’) Expansion Slots : One (1) PCI-e 3.0 x16 (LP), Three (3) PCI-e 3.0 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: 4 USB 3.0, 2 USB 2.0, Audio I/O, VGA, 2 x DP Input Devices : HP USB Slim Business Keyboard(N3R87AA) HP USB Optical Scroll Mouse(QY777AA) Power : 280 W Dimensions : 33.8 x 37.9 x 10 cm Weight : 7.6 kg