It's not opinion that AMDs can not tessellate on the level that Nvidia can but what is open to interpretation is whether or not that matters. AMD's tessellation engine choke out considerably after a tessellation factor of more than either 16
or 32 (I can't remember exactly, I will try and find evidence and update with the correction. EDIT: it is 16.) but the DirectX11 standard calls for tessellation factors of up to 64 levels. Only being able to cope with half of the called for tessellation levels was not what I was looking for.
is the closest thing to what I was looking for that I could find about the tessellation engine in the 6900 from AMD. Basically the last half of this page shows that all AMD did was take two of the inadequate tessellation engines from the 5800 and put them in the 6900. This is a problem because tessellation performs better the more range you have to work with, so the fact that the AMDs choke past a tessellation factor of 16 when games of the future have the ability to use 64 levels of tessellation (fingers crossed they actually do) was not something I personally wanted to be limited by.Edited by juano - 4/13/11 at 7:11pm