I have that exact same card and I also use RivaTuner with no problem like you're seeing. I've used the last 3 Nvidia drivers to date and now I'm on 182.06.
What version of Nvidia Control Panel and what version of RivaTuner are you using?
I believe it's all because your card doesn't seem to be properly recognized by the driver. Are you sure you clicked on the right card model when using the Nvidia driver download page?