We've asked ATI executives about CUDA and possibly PhysX support, and ATI explicitly said that for the time being ATI wants to support open platforms and technologies and that CUDA is not one of them.

We have a feeling that ATI means that CUDA is not that open, and the other dimension is that CUDA is Nvidia's and that ATI will probably do any means necessary to avoid its usage. To be on the safe side ATI didn’t say that CUDA is 'no go' as its Nvidia; they would never say such a thing, on the record.

ATI was very clear that they want to support Open CL, some new Apple Computing language for computations on a GPU, but at this time there is no place or direct plans for CUDA.

We are under the impression that ATI won't have any other choice than to jump on this bandwagon, but that won't happen overnight and it will directly depend on the success and adoption of CUDA. Remember, you need CUDA to get PhysX working on ATI GPUs, so we say sooner or later it will happen.