G@MER 01 - the links will show the FPS for the Games you would play. if the Game is NOT playable it will indicate as such.
Bear in mind, that the higher end GPU, FPS will increase BUT also battery life will generally decrease (not always, just normally).
One of the reasons I settled for the 540m, but then I'm not a maxed out gamer either.
As a side benifit, the Nvidia GPU is generally better at switching between dGPU and iDGP (SB & IB CPUs) when sitching between 2D and 3D applications. Desktops, I always use ATI dGPUs.