fractal 6 case fans with built-in PWM controller

[tangey]

Just put together a system that includes the above case that has 3 fans as standard, and also has a fan controller capable of control 8 fans. The case instructions indicate that the case fans and CPU fan be attached to the controller, with the input coming from the "cpu fan" header from the X570 board. I'm out of touch with this stuff, so just followed the advice from the case people.

I've done this. I'm new to Ryzen, and I note that when doing little work, the ryzen can for a short time switch up all the cores to boost, which raises the temp by 8-10c. This causes the MB cpu fan controller to up the PWM rate, and of course with the suggested setup all the fans speed up. Less than a second later the cpu reduces the core frequencies, the temps drop and all the fans reduce. This results in a slight, but noticeable fan noise increase/decrease undulation that is a bit annoying.

Is the case documents right, should case fans always be tied to the cpu fan or should the CPU fan solely be controlled by the "CPU FAN". The MB does have a separate system temp and associated "system fan" PWM header, and I am thinking maybe this should be used to control the case fans.

Looking for thoughts from those that have a lot more experience at this than me....thanks.

 

[tangey]

Thanks guys, mines is the MSI X570 Tomahawk. I understand that the CPU fan output is based on the CPU temp. the other headers are pump_fan, and sysfan1-sysfan4.
Not mentioned explicitedly on what basis sysfan1-sysfan4 adjust their output. I assume there is a system temp somewhere ???

 

[tangey]

Thaks for the suggestions guys. I'm now controlling the 3 stock fans using sysfan1-3, and have abandoned the fractal fan controller. I''m controlling the rear fan based on the CPU temp, and controlling the front 2 fans based on systemp. PWM didn't seem to work right, so I'm using DC for them.

Regarding the actual fans, I'm not tuned into fans, might well change them for some of the suggestions above when I've nothing left to do. Just trying to get a grip on all the things involved in system building/configuring, and your advice has definitely helped regarding cooling.