Anti-aliasling + HDR Rendering

hello everyone. in lineage 2, when i enable hdr rendering, the anti-aliasling becomes grayed. when i noticed it for the first time, i thought lineage 2 does not support aa + hdr. i have even tried to enable aa in graphics card settings and hdr in l2 settings and it caused the game to crash after the first frame rendered ingame (but not at the login screen). but one time i saw a screenshot with anti-aliasling and hdr enabled. so i thought that my graphics card does not support this. and now i just looked at its overwiew and i saw this:

http://www.sapphiretech.com/presentation/product/?cid=1&gid=4&sgid=337&pid=82&psn=&lid=1

so i should be able to enable hdr and aa at once. does anyone know how to do so without errors?

edit: solved this but unfortunately this graphics card is too weak for aa.