With our test system idling with stock settings the NH-C12P is starting out quite well. With an average temp of 31.25*C, it is running at 13.75*C under stock. With the low noise adaptor installed the cooler seems to be affected very little as there is a 1.5*C difference from full speed and the Ultra Low Noise Adaptor.
Under load the NH-C12P slipped back in the pack with an average temp of 46.75*C, but a very nice 19*C under stock. Again the NH-C12P did not seem to be affected by the low noise adaptors with only a degree separating low and full speeds.