AsRock AB350 Pro4 fans control problem

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   Dear EGN,

Greetings, this is ASRock TSD.

On this model, if you want to customize the fan speed on Chassis_Fan1, please connect 4-pin fan on it. 
Otherwise, the fan speed will only work at full speed with 3-pin fan.

Please refer below link, it provides detailed description.
http://www.asrock.com/support/faq.asp?k=AM4+fan

Thanks!

All the best,
ASRock TSD

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ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Offline Points: 8787	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Topic: AsRock AB350 Pro4 fans control problem Posted: 26 Apr 2017 at 6:01pm
	Dear EGN, Greetings, this is ASRock TSD. On this model, if you want to customize the fan speed on Chassis_Fan1, please connect 4-pin fan on it. Otherwise, the fan speed will only work at full speed with 3-pin fan. Please refer below link, it provides detailed description. http://www.asrock.com/support/faq.asp?k=AM4+fan Thanks! All the best, ASRock TSD

ruspartisan Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Apr 2017 Status: Offline Points: 7	Post Options Post Reply Quote ruspartisan Report Post Thanks(0) Quote Reply Posted: 25 Apr 2017 at 12:20am
	If you plan to adjust fan speeds according to CPU temperatures, you can connect Noctua's fans to the problematic header, and connect the case fan to CPU header, and change control method from PWM to DC. It's a dirty hack, but may work.

EGN Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Apr 2017 Status: Offline Points: 105	Post Options Post Reply Quote EGN Report Post Thanks(0) Quote Reply Posted: 19 Apr 2017 at 12:24am
	Look, this is fan test of CPU (2x Noctua 140mm / 4-pins) Chassis_Fan1 Chassis_Fan2 Chassis_Fan3 As you can see, all fans can be speed controlled by the motherboard, no matter it's 4-pins or 3-pins fan. Only Chassis_Fan1 has a constant speed. And I think it is software (UEFI) problem.

clubfoot Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 28 Mar 2016 Location: Canada Status: Offline Points: 246	Post Options Post Reply Quote clubfoot Report Post Thanks(0) Quote Reply Posted: 19 Apr 2017 at 12:03am
	For full control it must be a four pin fan.


EGN Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Apr 2017 Status: Offline Points: 105	Post Options Post Reply Quote EGN Report Post Thanks(0) Quote Reply Posted: 18 Apr 2017 at 11:55pm
	Hi, I have a problem with my motherboard AsRock AB350 Pro4 I have Noctua NH-D15 (2x140mm fans) and I use it with the slitter because there is only 1 CPU fan connector on the mobo. Everything is fine with both fans, they are fully controlled by the motherboard. BUT I have 3 PC-case fans (it is stock case fans of Cosair 780T) - 2 on the front and 1 on the back. All this fans has 3-pin connectors. So, I tried to use this fans with mobo. Unfortunately, CHASSIS_FAN1 works on constant speed only. The other two fans (1 in the fornt and one the back) are fully controlled by the motherboard. Please help me. How to make the first front fan (that is connected to CHASSIS_FAN1) to work with motherboard speed control? PS For speed adjustment I've used then latest version of original ASRock A-Tuning utility ver:3.0.137 Windows® 10 64bit 40.93MB 4/11/2017 Thanks!