我看ATI Tray Tool的說明好像X800系列可以開AAA，但新的AF沒有效果?似乎只能用在X1000系列上

http://www.guru3d.com/article/atitraytools/189/

「Added new option to enable "High Quality AF". Enabling this feature may impact performance. This feature is not supported by all ATI graphics cards. (it seems only R5xx series can handle this feature)」