TechPowerUp reports early adopters of NVIDIA's GeForce GTX 1080 Founders Edition video card are complaining about weird fan revving issues. It seems there's a driver issue somewhere as the fan something revs up significantly for a short period, even when you're not gaming:
The users observe that these sudden and unpredictable spikes in fan-speed are not in response to rising GPU temperatures or clock speeds. Sudden variations in fan-speed are worse than gradual variations in response to legitimate triggers, as it also means sudden changes in noise, which is distracting. Users also observe that you can't even use third-party software (eg: EVGA Precision) to stabilize or override the fan-behavior, as the speed-spikes don't respect custom settings.