Quote from: AFox on Today at 01:57:02 PM

Quote from: n0nce on Today at 01:08:20 PM

Are you sure that you got the PWM fan? If so, it is now running at 100% fixed fan speed, since the R909 only outputs a 3-pin DC fan signal and Noctua PWM fans default to 100% fan speed if they get a (any) 3-pin DC fan signal.

Yes, I confirm I bought the PWM model. The PWM part isn't important for the R909, but it is the 80mm Noctua model that has the most airflow.

I see, that makes a lot of sense! Only one question: the pin header outputs constant 12V? So, no control at all even on DC (3-pin) fans? Because in that case, I'd get the PWM, too. But if it meant losing fan control, I'd prefer an actual DC fan whose RPM can be controlled by the miner. No reason to 'over-cool' the hashboard, if there's more noise reduction to be had, right?