Asrock B450 Pro4 and CPU cooler problem

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   Hello!
I have the following system:

Ryzen 2600
Asrock B450 Pro4
G Skill Ripjaws V 3200 Mhz/ set at 3000 atm from bios/

For my Ryzen CPU I bought an Arctic Freezer 34 eSports Duo cooler and I have a really strange problem with it. So I instaled the cooler and I connected it to cpu_fan1 on my motherboard. When I started the PC I noticed the CPU cooler was very noisy so I investigated further and it seems that one of the fans of my Arctic Freeze is always spinning at max speed/the one at the back/ and cannot be controlled from bios while the other one - front one is fine and can be controlled. Both fans are connected properly to each other /PST/. I tried connecting only one of the fans at a time to the cpu_fan1 and I had the same result. front fan can be controlled while the back fan cannot be and run at max speed. Both fans are with 4 pins. I tried connecting the original ryzen 2600 fan to cpu_fan1 and everything is fine with it too. 
Now the really weird part is that I tried connecting the back fan/the problematic one/ of the Arctic to cpu_fan2 and there the fan was working properly and I could control it.
So my question is why I cannot control both fans together when connected to cpu_fan1 header but only one of them and do I have to use the cpu_fan2 for both of them instead ? And what does the Smart Fan Speed Control mean for the MB /since it is missing for cpu_fan1 in the manual/?

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Haku_ Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Dec 2019 Status: Offline Points: 3	Post Options Post Reply Quote Haku_ Report Post Thanks(0) Quote Reply Topic: Asrock B450 Pro4 and CPU cooler problem Posted: 31 Dec 2019 at 1:38am
	Hello! I have the following system: Ryzen 2600 Asrock B450 Pro4 G Skill Ripjaws V 3200 Mhz/ set at 3000 atm from bios/ For my Ryzen CPU I bought an Arctic Freezer 34 eSports Duo cooler and I have a really strange problem with it. So I instaled the cooler and I connected it to cpu_fan1 on my motherboard. When I started the PC I noticed the CPU cooler was very noisy so I investigated further and it seems that one of the fans of my Arctic Freeze is always spinning at max speed/the one at the back/ and cannot be controlled from bios while the other one - front one is fine and can be controlled. Both fans are connected properly to each other /PST/. I tried connecting only one of the fans at a time to the cpu_fan1 and I had the same result. front fan can be controlled while the back fan cannot be and run at max speed. Both fans are with 4 pins. I tried connecting the original ryzen 2600 fan to cpu_fan1 and everything is fine with it too. Now the really weird part is that I tried connecting the back fan/the problematic one/ of the Arctic to cpu_fan2 and there the fan was working properly and I could control it. So my question is why I cannot control both fans together when connected to cpu_fan1 header but only one of them and do I have to use the cpu_fan2 for both of them instead ? And what does the Smart Fan Speed Control mean for the MB /since it is missing for cpu_fan1 in the manual/?