Oh? I have have yet to see a review where AMD's cards don't take a massive hit when AA is enabled. It's an architectural limitation which AMD will likely resolve with upcoming products.
As for the results, I am 100% confident in saying that on average with the latest WHQL drivers, HD 5870 is at least 30% slower at 1920 x 1200 4xAA than the GTX 480 in newer games. I'd even venture that this carries over into quite a few DX9 games as well but it won't show up on charts simply due to CPU bottlenecks artificially impacting the scores.
To me, DX11 and to a lesser extent DX10 really is all that matters in terms of performance when testing $150 and above GPUs. Even a lowly GTS 450 has no issue pushing out 60 FPS+ in the current crop of DX9 games at 1920 x 1200.
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