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Originally Posted by Kynes
AFAIK when you select Performance Adaptive Anti-Aliasing, you have half the alpha texture samples than geometry samples, so if you choose 2xPA AA in F.E.A.R. you don't get any adaptive AA. You can check it with the program DX9FSAAViewer.
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I'm pretty sure that there's a difference in performance and quality between 2xAA and 2xPA AA. That's why we've labelled it that way.