Okanekami

I have my M14xR1 for over 2 years now and now I had enough of the Optimus. When trying out Saints Row 4, I set the graphic option to auto-detect, and guess what happen, fps is like 3. So I reset the game, make sure that I choose Nvidia card, same thing happened. Is this because 555m can't handle the game, because I really don't thing that's the case. I know it's old and all, but still, it's not that old, right? Also, no matter what I do it seem as if PhysX must be process by CPU or something. So really I have two questions. First, is the one in the tittle and second, is it really Optimus or is it my m14x?