Quote from: MrMik on Today at 10:30:14 AM

Quote from: n0nce on November 20, 2022, 11:15:54 PM

No; you could basically turn off the fan completely by setting these parameters for instance. This should set the fan to 1% speed regardless of temperature.

Code:

./apollo-miner -fan_pwm_low 1 -fan_pwm_hi 1 <rest of parameters>

Here is my understanding of those 4 parameters. They basically set a 2-point fan curve. I used the default values as specified above.

Thanks for the explanations, I will have to spend some time on trying to understand and implement that.

I thought the Fan temp settings in the Full Package Apollo would be using a temp curve similar to the one you showed above, except I imagined it actually curved.

But when I set the Full Package Apollo Fan temp settings to 70c / 90c, while keeping the actual miner temperature below 60c with the added fan, then the stock fan continues to run at around 1800rpm.
See screenshot.

That's why I thought the stock ASIC fan cannot be turned lower than about 1800rpm.

Some fans have a minimum RPM they won't go below, it depends on the fan revision/vendor. We had to source like 3-4 fan vendors during the pandemic all with slightly different fan controllers.

You can test this with the -fan_pwm_hi 1 parameter. That will force the PMW controller to not output anything and make the fan either not spin or spin at its lowest speed possible.