Changing memory clock rate and core clock rates for testing scalability

I saw in the following paper that they are changing the memory clock rate and the core clock rates on an NVIDIA GTX280.
[url=“http://download.microsoft.com/download/2/d/6/2d6d8a71-2715-4c4d-bde1-d21ee9ca95b6/Discrete%20Fourier%20Transforms%20on%20GPUs.pdf”]http://download.microsoft.com/download/2/d...20on%20GPUs.pdf[/url]

How can I change these parameters?

Thanks.

I saw in the following paper that they are changing the memory clock rate and the core clock rates on an NVIDIA GTX280.
[url=“http://download.microsoft.com/download/2/d/6/2d6d8a71-2715-4c4d-bde1-d21ee9ca95b6/Discrete%20Fourier%20Transforms%20on%20GPUs.pdf”]http://download.microsoft.com/download/2/d...20on%20GPUs.pdf[/url]

How can I change these parameters?

Thanks.

Does anyone have experience with NVAPI [url=“http://developer.nvidia.com/object/nvapi.html”]http://developer.nvidia.com/object/nvapi.html[/url] for this matter?