570M

While our recent review of the Alienware M17x R3 proved you could have a gaming notebook that was still capable of halfway decent battery life, the hybrid solution found in that machine was more the exception than the rule. NVIDIA is refreshing their mobile high end, and while that's mostly newsworthy on its own, the big improvement is Optimus support for every part in the GeForce 500M series, from top to bottom. That includes the king of the hill, the (slightly) new GeForce GTX 580M.