Does anybody here use Rivatuner?

Backstory:

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I downloaded it today so I can control fan speeds. It's under Nvidia Control Panel's "Automatic Control" right now. According to it, it spins at 0% (that's BS since it's physically spinning - though how slowly I can't be sure) at ~59C, and will dynamically climb to ~9% @ 63C etc. Temps max out at ~71C using ATI Tool, and the fan spins at 49% at that point.

Since the 9800GTX+ is rated for a max temp of 105C though, I figured I could set the threshold higher, or at least allow a longer period of zero/low fan speed, followed by a steeper climb in fan speed/ degree when I'm actually gaming.

Due to season temperature or day/night temp variances, the fan is audible when things get to 60C or higher (5%?). I hoped to do something about that.

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Anyway, for people used to this program, I notice that the fanspeed range you can adjust on it is 25-100%. According to Nvidia Control Panel though, my fan's usually a lot slower anyway. Is this a limitation of Rivatune, or is it a misread by Nvidia Control Panel {NPC from now on}(ie the fan's min speed is 25%, Nvidia just scews up reading it right).?

The logical thing to do would have been to set it on 25% using RivaTuner and see if the fan ramped up audibly.

I didn't actually hear any difference (If I ramped up to 25% on NCP, I would hear it), which leads me to my second question.

No doubt NCP and Rivatune would be fighting over fan-control, amongst other video-card settings. If I used Rivatune, would I have to uninstall NCP/nTune, leaving only the drivers behind?