Can someone explain gamma corrected AA

[Xarick]

and should I turn it on? will it make everything dark? One of the things I didn't like about my 9800pro was if I used AA it make everything dark... like the brightness was turned down.

 

[TheRyuu]

Google+Anandtech is your friend:
http://www.anandtech.com/video/showdoc.aspx?i=2870&p=12

And the article is for the G80 but the basic principal of gamma AA is the same no matter what.

 

[40sTheme]

Basically, it adjusts to your monitors gamma settings and also can improve edge smoothness somewhat.