I have my x800XL overclocked with ATI Tool and ATI Tool has the option to load an Overclock profile when a 3D application is detected. My question is, is it better to have your card underclocked in windows? Like if I have my card underclocked below stock will it use up less power and have less heat generated? I heard the nvidia cards underclock themselves when in 2D mode. So when I have a 3D app loaded it'll use the Overclock setting, then when I quit the 3D app, it'll go back to the underclock state. Think thats a good idea?