GPU temperatures didn’t exceed 74ºC at factory clocks. The Signature 2 fan is silent in idle mode but even when it’s under full load you won’t hear it until you come very close to the chassis, or stick your head in it.  

We left the fans in Auto mode during our overclocking session and the temperature went up to 78°C. Considering that the fans were just slightly audible as you can hear some airflow from the graphics card in a silent room, this is good result.