Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q77 Processors : Intel i3 2nd Gen, Intel Core i5,i7 3rd Gen, Intel Peptium, Intel Celeron Memory Support : Four (4) DIMM slots, up to 16GB DDR3 SDRAM Hard Drive : Up to 1TB 7200 rpm Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays : One (1) internal 3.5", One (1) external 5.25" Expansion Slots : One (1) HH PCIe x16, One (1) HH PCIe x16 (routed as x4), One (1) HH PCIe x1, One (1) HH PCI Graphics : Integrated Intel HD Graphics Audio : Internal Dell Business audio Communications : Intel 82579LM GbE Network Connection I/O Ports : Front: Two (2) USB 2.0, Two (2) USB 3.0, Audio I/O, Internal: Two (2) USB 2.0, Exterrnal: Two (2) USB 3.0, Four (4) USB 2.0, VGA, Two (2) DP, RJ-45, Serial, Two (2) PS/2 Input Devices : Standard Keyboard (PS/2 or USB) Power : 240 W Dimensions : 31.2 cm x 29 cm x 11.4 cm Weight : 7.9 kg