Ntune "Changes made were invalid"

I'm not sure if this is in the right section so please feel free to move it to where it's suitable.

I keep on getting a persistent problem with Ntune where it reverts back to the factory clock speed instead of the overclocked speed. Occasionally it'll allow me to keep the OC settings. Also, sometimes when I try to OC the GPU, there is an error message that says "the changes made were invalid". Does anyone have a solution to this?

 

use Rivatuner, works very good for me

 

Rivatuner does not allow me to go pass a certain clock speed (max 600/1200/450) whereas Ntune does.

 

To be able to get past the default maximum clock speed in RivaTuner:

*Go to the Power User tab. Click OK on the warning.
*Open the RivaTuner\Overclocking\Global section
*Double-click on MaxClockLimit. Put in a value of 100 or greater; the higher it is, the more you can overclock. Also note that the higher the value, the less precision you have on the overclock (the increments between settings are larger).
*Go back to the Main tab, go to the overclocking section, and you'll see that you can now overclock higher.

Use with caution. My 475/400 MHz core/memory card allows a maximum of 1395/1175 MHz with a MaximumClockLimit of 125. I've only actually used this setting to overclock 2D well beyond initial limits in order to make PowerMizer useless, but if your card can handle higher clocks than the default allowances, go for it - cautiously.

As for why nTune would give that error, though, I don't know.