God I hope someone at nVidia leaks that the claim is based on their performance in CUDA computing.


In all seriousness though, either way it's all just marketing. We know both sides can and do specifically tweak drivers and even hardware for certain benchmarks, and they always have. Claiming you're the best at a single benchmark is silly for that reason alone. But AMD does have a fair point, if nVidia is going to SAY they have the fastest card, they might as well at least offer a benchmark of some kind as a basis.