Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel H81 Processors : Intel 4th generation Core i5, i3 Dual Core, Intel Pentium, Intel Celeron Memory Support : Two (2) DIMM slots, up to 16GB DDR3 or DDR3L SDRAM, 1600MHz Hard Drive : Up to 1TB 7200 rpm Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays : 1 internal 3.5", 1 external 5.25" (slimline) Expansion Slots : 1 half height PCIe x16, 1 half height PCIe x1 Graphics : Integrated Intel HD Graphics 4600 Audio : N/A Communications : Integrated Realtek RTL8151GD GbE Network Connection I/O Ports : 2 external USB 3.0 ports (rear) and 6 external USB 2.0 ports (2 front, 4 rear); 1 Serial port (optional); 1 PS/2 (optional); 1 RJ-45; 1 VGA; 1 DisplayPort 1.2; 1 Mic-in & 1 Headphone out (front); 1 Mic-in/Line-in & 1 Line-out(rear) Input Devices : Dell Standard Keyboard, Dell Multimedia Keyboard, Dell USB Mouse, Dell Laser Mouse Power : Standard 255W PSU Active PFC or optional 255W up to 90% Efficient Dimensions : 31.2 x 29 x 9.3 cm Weight : 6 kg