GTX 680 Beast’s cooler had no trouble cooling the overclocked GK104 GPU, which is clear from the fact that fan RPM didn’t exceed 53%, i.e. 1950RPM. The GPU hit 72°C during gaming, which is 6-7°C lower than on reference cards. Furthermore, the Beast’s cooler is not only silent when idle, but impressively quiet when working hard as well. In fact, we had to open the case in order to hear the fans during long gaming sessions.
There are no signs or specs on the fans but we can confirm they do the job well. They only get loud beyond 65% RPM, but fan speed never exceeded 54% RPM, i.e. they were quiet.