I'm using ATItool. It even puts a little temp monitor in your task bar. Despite that it's called "ATItool" it fully supports Nvidia cards. The only drawback that it has it that the "fan control" settings don't show up, but at least you can monitor your temps. It even tracks min/max/avg temps for you.
I was able to reach much higher stable clocks using it as well over the buggy ntune crap.
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