Later today we'll see the arrival of NVIDIA's GeForce 337.50 beta driver, this new release is NVIDIA's answer to AMD's Mantle. We'll have to wait for some reviews to verify if what NVIDIA claims is true but what the GPU maker claims is very promising. Thanks to some big driver changes NVIDIA managed to significantly reduce CPU overhead in the most important API calls in DirectX 11.2. The result is that you can expect big gains in performance in a very wide range of games. Not a lot of details were revealed but it seems NVIDIA managed to mimick AMD's Mantle without having to create an entirely new API.
What’s interesting is that we already have a change-log, which summarizes performance gains in selected titles.