According to our source, Nvidia are having some trouble with some games running under Windows Vista enabling 16x coverage sampling antialiasing (CSAA) when 4xAA is selected in the game menu, resulting in deflated performance on Geforce 8800 cards.
The games that are currently known to experience the problem are:
* Battlefield 2 * Battlefield 2142 * Sin Episodes * Half-Life 2 * Half-Life 2 Lost Coast
Nvidia has posted acknowledgement of the problem here
In order to rectify the problem:
To set standard 4xAA in these applications, please set 4xAA in the game, and also enable “Enhance the application” antialiasing mode with a 4x antialiasing setting in the NVIDIA graphics driver control panel.
Currently, Nvidia are working with developers to implement better in-game CSAA support. You can see CSAA menu selections in Half-Life 2: Episode One and Supreme Commander.
Nvidia has also posted their latest Vista driver news here