X399 Taichi - Only cha_fan2 can control 3-pin fans

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   Hi,
I have a X399 Taichi mobo and 4 chassis fans to cool my case. All of them are 3-pin. I just installed A-tuner to try and tune their speeds in the "FAN-Tastic Tuning" tab.

The first problem I encountered is that only cha_fan2 fan header can control the fan speeds and all other fan headers (cha_fan1, cha_fan3, cpu_opt) are running my fans at full speed no matter what I do in the graph. Why is that? I tried 3 different fan models (all of them Fractal Design) and the result is the same - can't control their speed on headers different than cha_fan2.

The other problem is that I don't get any RPM reading at cha_fan2, it says "0" in BIOS, A-Tuning and HWMonitor. All other fan headers report the speeds fine.

How can I resolve these issues? Thanks in advance! 

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duke Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Oct 2017 Status: Offline Points: 16	Post Options Post Reply Quote duke Report Post Thanks(0) Quote Reply Topic: X399 Taichi - Only cha_fan2 can control 3-pin fans Posted: 05 Feb 2018 at 8:02am
	Hi, I have a X399 Taichi mobo and 4 chassis fans to cool my case. All of them are 3-pin. I just installed A-tuner to try and tune their speeds in the "FAN-Tastic Tuning" tab. The first problem I encountered is that only cha_fan2 fan header can control the fan speeds and all other fan headers (cha_fan1, cha_fan3, cpu_opt) are running my fans at full speed no matter what I do in the graph. Why is that? I tried 3 different fan models (all of them Fractal Design) and the result is the same - can't control their speed on headers different than cha_fan2. The other problem is that I don't get any RPM reading at cha_fan2, it says "0" in BIOS, A-Tuning and HWMonitor. All other fan headers report the speeds fine. How can I resolve these issues? Thanks in advance!

orionbg Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 Feb 2018 Location: Bulgaria Status: Offline Points: 16	Post Options Post Reply Quote orionbg Report Post Thanks(0) Quote Reply Posted: 05 Feb 2018 at 5:17pm
	I have a similar issue but I'm using 4 pin fans. The CPU_FAN1 and CHA_FAN3 headers are controlling the speed without issue but CHA_FAN2 (bottom one next to the RGB header) Is running at full speed all the time... No matter what I set in the BIOS of in that excuse of a program A-Tuning...
	Asrock X399 Taichi, AMD Threadripper 1950X, 32GB G.SKILL TridentZ RGB 3200MHz, 256GB Samsung PM961 nvme, 512GB Samcung 850 EVO, 512GB Intel 5400S, GTX1080Ti FE, Lian-Li PC-O11WGX case, Custom W.Loop