In case auto-fans aren't working or you have set up the fan triggers and you see that the trigger was sent but wasn't applied, your GPU drivers aren't accepting fan control command.
Usually, this is connected with too intense overclocking and to solve it, you will need to increase the power limit to give your GPUs more power. After you do, enter command
mreconf and wait for a rig to reboot.
If auto-fans aren't getting applied this could also be due to the mixed models of GPUs that aren't accepting drivers values that good when running together. You can let us know and we will take a look.
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