For our temperature tests we loaded the system for 10 minutes using Furmark and recorded the GPU temperature using CPUID HWMonitor. We then restarted the system and left it idling at the desktop for 10 minutes before recording idle temperatures. The temperatures recorded are based on an ambient temperature of 20 degrees C.
These results are fairly good and show the raw performance capability of this heatsink. They still fall shy of those achieved by Arctic's models though.