Last October at NVIDIA's Editors Day, we had the "opportunity" to hear from several gaming industry professionals about how unimportant DirectX 10.1 was, and how most companies weren't even considering supporting it. Amazingly, even Microsoft was willing to go on stage and state that DirectX 10.1 was only a minor update and not something to worry about. NVIDIA clearly has reasons for supporting that stance, as their current hardware -- and supposedly even their upcoming hardware -- will continue to support only the DirectX 10.0 feature set.
NVIDIA is within their rights to make such a decision, and software developers are likewise entitled to decide whether or not they want to support DirectX 10.1. What we don't like is when other factors stand in the way of using technology, and that seems to be the case here. Ubisoft needs to show that they are not being pressured into removing DX 10.1 support by NVIDIA, and frankly the only way they can do that is to put the support backing in a future patch. It was there once, and it worked well as far as we could determine; bring it back (and let us anti-alias higher resolutions).
We can see the result of using pixel shaders to do anti-aliasing in the resulting performance drop. What's noteworthy is that the drop isn't nearly as bad on ATI hardware running AC version 1.00. In other words, the 1.02 patch levels the playing field and forces ATI and NVIDIA to both use an extra rendering pass in order to do anti-aliasing. That probably sounds fair if you're NVIDIA -- or you own NVIDIA hardware -- but ATI users should be rightly upset.
http://www.anandtech.com/showdoc.aspx?i=3320&p=1
feel free to check the whole review.Its a nice one and it has been long since I read a nice review