Sometimes in order for Overclocking or Fan Control to work you need to force driver versions. To do this go to the Power User tab in RivaTuner.Expand the RivaTuner \ System option.
After you have expanded the option, scroll down until you find ForceDriverVersion. Double click on the collumn next to it and type in the driver version. Example: nvidia driver 158.19 would be 15819
Then click the check icon, click Ok or Apply and restart RivaTuner.
Thank you very much for using this Tutorial. This article was written by Derek Wood