Hello,
I have an aquaero 6 linked to an octo on the aquabus high speed link since 2019, and enermax rgb fans.

The octo is not plugged into USB, though with aquabus it can be easily controlled from aquasuite.
That config used to work correctly.

But now one of the fan is running at full speed and can't be controlled, whatever mode I set: PWM, Speed or Power.
I verified the output value in power mode is displayed at 0V, still the fan runs full speed.
I tried Power, PWM and Speed control at 50%, the fan still runs at full speed.

I unplugged it, it stopped of course
I have only one other fan plugged into the octo, and I can control its speed correctly.
I switched the plugs, same result. I can control the 1st fan but not the other one.


Is it my 1st fan which is the issue ?
How could it still run at full speed when the output voltage of the octo is 0V ??

I already switched to the other output that was controlling my other fan, which I am able to control whatever output I use.

It looks like the fan speed can be controlled only when the RGB connector is not plugged in the motherboard (MSI).

So it is not really an issue with OCTO.

Did you have this issue ?

I found the issue !!
it is caused by AQUASUITE !!



This is because this fan has a special behavior:
When its voltage is set to 0V (or unplugged), and its RGB plug is connected to the motherboard, it runs full speed.



Fan Brand and model:
ENERMAX SquARGB 12cm



When AQUASUITE wants to stop the fan (in PWM mode), instead of keeping the voltage at 12V without any RPM, it cuts the voltage to 0V.

The fan thinks it is not connected anymore, and instead uses the RGB power source to run full speed.

I worked around that temporarily by "holding minimum power" in aquasuite.
But it would be much better to have a checkbox to prevent Aquasuite from cutting the 12V power when it wants the fan at 0%.

It looks like the older versions of this fan don't have this "feature".
Only the versions of this year are like that.