I recently bought Far Cry 4, after being told to buy it for my PC rather than Xbox360, because supposedly it would perform better on my laptop. Unfortunately I did not look at the minimum system requirements, because I believe my graphics card is not nearly good enough. When I run the game, even on lowest resolution and graphics quality, it runs sluggishly and obviously looks terrible. My problem is that, if I install a new graphics card (would be a Geforce 650 GTX or so) it voids my warranty, which is very important because I use my computer for engineering school. Is there a way to use a GPU like the one I mentioned, through an external adapter or some other apparatus? I have a Lenovo W540 quad core.