When I saw your comment I was a bit surprised so I've gone over and had a quick read at their article. It seems they have called that one wrong. Custom Filtering AA has been present in the ATI drivers since the R600 (2900), in fact we covered it on this page: http://www.driverheaven.net/reviews/r600reviewz/whatis.php about half way down. About 3-4 months after that launch a 3rd mode was added (edge-detect) and since then all 2000, 3000 and 4000 products have been able to use this feature. Although, like any other demanding setting, you need faster cards to take advantage of the higher settings.