For a few months now, some fan in my PC has been suddenly turning to max speed for a couple of minutes and the turning back to normal speeds. I have been keeping track on temperatures and fan speeds on HW monitor and other monitor softwares. Everytime it does it, I look at my temperatures and fan sped from HW monitor, and so far my temps have been, 40-50 for the CPU and 50-60 for the GPU. My fan curves are set so these temps should not trigger max speeds. A few times my GPU fan speed has said the max RPM was over 10k, so I guess it has something to do with that. It only shows the insane RPM for a moment and very rarely, after that it shos the current RPM as about 1500, but the fan still continues on max speed for a couple of minutes. It's probably a driver or ahrdware issue. My drivers are up to date also.