The model number is NP880Z5E-X. I've got a 15-inch, Windows 8 system, i7 Core, 8-GB RAM, 1-Terabyte Drive, RealTek High-Definition audio. I have not updated to Windows 8.1 because Best Buy Geek Squad, about six months ago, said that there were known problems with this model and the 8.1 update...