Xorg.conf, which modules should be loaded for better performance?

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http://unix.stackexchange.com – In general what is supposed to be in the Module section of the Xorg.conf file in order to get maximum performance from a graphic card? At the moment my Module section is empty... also because I didn't find any useful doc about modules. ...and if it matters, my graphic card is an ATI Radeon HD 5700 Series and I've already installed the Catalyst 12.6 drivers on my Ubuntu 12.04 box. (HowTos)