Are you setting the fan speed using nvidia-settings in linux? If not, this is the first problem to address. See https://devtalk.nvidia.com/default/topic/1003810/linux/adjust-nvidia-gpu-fan-speed-multiple-gpus-one-monitor-/
The following sudo commands will enable fan speed adjustment:
nvidia-xconfig --enable-all-gpus
nvidia-xconfig --cool-bits=4
You then need to manually adjust the fan speed. Unfortunately as far as I know there is no “Nvidia profile inspector” for linux.
Here’s an example for your .bashrc that will 1) increase fan speed to 85% or 2) reduce fan speed to default. As always, test and use at your own risk:
alias nvidia-fanup=‘export DISPLAY=:0; nvidia-settings -a GPUFanControlState=1; nvidia-settings -a GPUTargetFanSpeed=85’
alias nvidia-fandown=‘export DISPLAY=:0; nvidia-settings -a GPUFanControlState=0’
If you are running a 4 GPU system, I would also suggest removing the backplates of the 3 lower cards. The Pascal FE cards have a two-part backplate specifically for this purpose. This gives the fans a little more room to breath and can lead to a few degrees C of improvement.