Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset :Intel H61 Express Chipset Processors :Intel Celeron, Intel Pentium and Intel Core i3, Intel Core i5, and Intel Core i7 2nd/3rd Gen Memory Support :Two (2) DDR3 SDRAM DIMM slots up to 8 GB Hard Drive : SATA up to 2TB Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays :External: One (1) 5.25-inch, Internal: One (1) 3.5-inch Expansion Slots :One (1) PCI Express x16, Three (3) PCI Express x1, One (1) Mini PCI Graphics HD Integrated graphics Audio : Realtek ALC656 Communications :Integrated Realtek RTL8171E Gigabit Ethernet Controller I/O Ports :Front: Two (2) USB 2.0, Headphone/Mic, Rear: Four (4) USB 2.0, VGA, DVI-D, Audio I/O Input Devices :HP USB Standard Value Keyboard HP USB Optical Mouse Power :300W Dimensions :16.5 x 38.9 x 36.8 cm Weight : 7.18 kg