There's a point everyone seems to be missing here (everyone is harping on about the GPU implementation of MANTLE) and that is that this API optimises the CPU as well. So what you'll see is that games that use MANTLE will see a boost irrespective of the GPU - due to the CPU optimisations the API will bring to the mix - as well as an additional boost if the API detects an AMD GPU as well... so it would seem to me that this API is a win REGARDLESS of whether you're running a green team or red team card - unless I've completely misunderstood the slides and the info put out by the presentation...