Im trying to overclock the 2600XT in Vista and going nowhere fast. I have the latest 7.9 cats and Im using DH mobility program to alter the drivers. When I go to install the altered drivers it only gives me an option to install the catalyst manager. Im getting pretty frustrated here as I want to unlock the potential. I am trying rivatuner 2.04 and the newest atitool as well to no avail on the 7.7s provided by bootcamp. Has anyone had any luck overclocking this iMac 2600XT in Vista? Thanks in advance!