Noise Level Results
Limiting the voltage to 7.5 volts left the fan running at 1600 RPMs. I have to give Zalman big props on the CNPS part of this design; this 80mm fan is barely audible at the 28dB level that was present at this power level.
Once the fan was allowed to flex its wings, if you will, the speeds dramatically increase to near 2800 RPMs, and you can feel a subtle breeze around the cooler at this point. The CNPS portion is still working at this point as it delivered a 45dB level of noise in an open air system.
Granted, most cases will kill some of that noise, and with a PSU hovering over it, you aren't likely to ever see it, let alone hear it.