Originally Posted by OWA
One of the sites said they were going to ask about that to see which was one was correct. They speculated the shinier one could be a result of having to do the lighting in two passes so it's overbright whereas with the SM3.0 it was one pass so it's not. Of course, they said it could go the other way also. I think they had hoped to get answer from Crytek on that but not sure if they have yet.
Edit: Cool graph in the DH article.
or Perhaps.. Fp32 precision makes speculars reflections more thinner and more precise,in that case it will not be possible to have 100% identical speculars ,because NVidia and ATI support diferent precisions..