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Fan speed is PWM-regulated from about 1100 RPM to 4230 RPM (according to the PrecisionX monitoring tool). The GPU temperature is up to 76°C with the fans regulated automatically. Subjectively said the card remained quiet, we noticed only small changes in noise levels from inside of the closed PC case. 
With the fans set at maximum speed the card is really loud but the GPU temperature is only 60°C.
GPU temperatures didn’t exceed 78ºC after overclocking.