Test System Setup
To see our testing methodology and to find out what goes into making our charts, please refer to our CPU Cooler Testing and Methodology article for that information.
For the stock run, we do limit the fan speed on all coolers and take the PWM curve out of the mix. Here we found the NH-D15S performed identical to the NH-D15 with a 49.5 degree result. Considering that it takes a TEC assist or some sort of water cooling to better that result for some products, we can all agree that is really good.
When the overclock is then applied, we see the NH-D15S falter, but just ever so slightly. Of course, more fans on the cooler should improve on thermal results, but coming in less than a degree away from the D15 at 70.25 degrees is again very good for a dual tower cooler with only a single fan to cool it.
Noise Level Results
While controlling the voltage for the stock run, we found the NF-A15 PWM to be spinning at 1020RPM, and at this time we found it inaudible, but the meter was showing us 24dB. Here there is no way to take away from chart topping performance.
It's not quite the best when it comes to fan noise with it spinning at 12 volts. Here we saw a maximum speed of 1520RPM, and from a foot away from the back of the cooler, we were reading 33dB at this time. It's slightly better than the original, but remember there is one less fan chopping the air as well.
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