i have the dell 8500 xps very nice computer. but i got to thinking about going from AMD graphic to nvidia. but accoding to a google this thing has a nvidia gt640 already installed? if thats the case thats money savings and i can drive my truck sim with it. because the game i have is 10 years old and don't work on AMD cards. what do you guys think. how do i get to the nvidia if this thing has it?