Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset :Intel Q67 Express Chipset Processors :Intel Core i7 2nd Gen Memory Support :Four (4) DIMM slots , Up to 16 GB DDR3 SDRAM  Hard Drive :SATA 6.0Gb/s 7200 rpm Removable Media :Super Multi-Burner DL DVD±RW SATA 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, One (1) LP PCI Express x1 Graphics :Intel HD Graphics in processor Audio :High De?nition (HD) Audio, Realtek? ALC662 codec Communications :Gigabit ethernet port, Intel 82579 I/O Ports :Front: Two (2) USB, microphone, headphone  Rear: Six (6) USB, Stereo LI, Speakers LO, VGA, DP Input Devices :Pro USB Keyboard (USB connector), 104-key, black, Lenovo? logo Enhanced Optical USB Mouse, 1000 dpi, black, Lenovo logo Power :240 watts, autosensing, 85% PSU Dimensions :337mm W X 369mm D X 99mm H (13.3" W X 14.5" D X 3.9" H in) Weight :7.5 kg (16.5 lb)