Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset :Intel Q57 Processors :Intel Core i3, Intel Core i5, Intel Pentium & Celeron Memory Support :Four (4) DIMM slots , Up to 16 GB DDR3 SDRAM  Hard Drive :250GB or 500GB, SATA 3.0Gb/s 7200 rpm Removable Media :DVD-ROM/DVD Recorder Expansion Bays :External: One (1) 5.25-inch, One (1) 3.5-inch, Internal: One (1) 3.5-inch Expansion Slots :One (1) LP PCI Express x16, One (1) LP 32-bit PCI 2.3 Graphics :Intel HD Graphics in processor Audio :High Definition (HD) Audio, Realtek ALC662 codec Communications :Gigabit ethernet port, Intel 82578DM I/O Ports :Front: Two (2) USB, microphone, headphone  Rear: Six (6) USB, Stereo LI, Speakers LO, VGA, DP Input Devices :Standard Keyboard, Mouse (USB) Power :240W Dimensions : 355 x 31.7 x 9.9 cm Weight 9 kg