For our temperature tests we loaded the system for 10 minutes using Prime 95 and recorded the CPU temperature using CPUID HWMonitor. We then restarted the system and left it idling at the desktop for 10 minutes before recording temperatures. The temperatures recorded are based on an ambient temperature of 20 degrees C.
Some impressive numbers here from the NH-U14S. It will be ideal for those looking for a slightly better performing cooler than the NH-U12S, without sacrificing RAM compatibility.