Precision has been really buggy on me too, so I switched to MSI Afterburner with my new card. I prefer it, was able to set a custom auto-fan profile that works great without me having to manually adjust.
Edit: And nom, 2d clocks are always super freaky low.
It's not a bug... for the new GTX400s, core speed and shaders are linked so your clock speed would be half of your shader speed. When you increase your shader speed by whatever speed, your clock speed goes up by 1/2 of it.
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