For the record: AMD said they are opening up the Mantle API, so that anyone can access the source. They also said that they are open to support any hardware that offers the features required to use Mantle. It is not the tech from the XBONE or the PS4, it is something similar, but their goal is to allow access to low-level GPU programming on any hardware that has the minimum requirements -> DirectX doesn't do this and won't do this, at least in the near future. nVidia is open to support it, just as it was invited to implement any other tech AMD released, such as their own physics solution. But nVidia is anti-competitive, the code they released to run on CPUs is intentionally crippled so it will be slow as hell, for example. Among the professionals, nVidia pushed CUDA for years, they didn't care to implement OpenCL properly (as an example bitcoin mining on an nVidia card is 10 times slower than on a CPU), now that industry is moving to OpenCL and they pretty much have to play the catch-up game. Hope it will be the same with games too.