Problem with 3 pin fans

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   Dear Johusan,

Greetings, this is ASRock TSD.

For this case, we tested on AB350M Pro4 with BIOS P3.10.
Install two 3-pin chassis fans on CHA_FAN1 and CHA_FAN2.
The fan speed are both under range and they also spin properly on the system.

So we would like to provide some suggestions for verifying:
1. Please refer to the user manual to clear CMOS.(Page 27)
    Link: http://asrock.pc.cdn.bitgravity.com/Manual/AB350M%20Pro4.pdf
2. Please re-flash BIOS P3.10 again.
    Link: http://www.asrock.com/MB/AMD/AB350M%20Pro4/index.asp#BIOS
3. If possible, please change another 3-pin fan for verifying.
4. If possible, please install the fan to another system for verifying.

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: 8532	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Topic: Problem with 3 pin fans Posted: 08 Nov 2017 at 2:46pm
	Dear Johusan, Greetings, this is ASRock TSD. For this case, we tested on AB350M Pro4 with BIOS P3.10. Install two 3-pin chassis fans on CHA_FAN1 and CHA_FAN2. The fan speed are both under range and they also spin properly on the system. So we would like to provide some suggestions for verifying: 1. Please refer to the user manual to clear CMOS.(Page 27) Link: http://asrock.pc.cdn.bitgravity.com/Manual/AB350M%20Pro4.pdf 2. Please re-flash BIOS P3.10 again. Link: http://www.asrock.com/MB/AMD/AB350M%20Pro4/index.asp#BIOS 3. If possible, please change another 3-pin fan for verifying. 4. If possible, please install the fan to another system for verifying. Thanks! All the best, ASRock TSD

Johusan Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 25 Jun 2017 Status: Offline Points: 12	Post Options Post Reply Quote Johusan Report Post Thanks(0) Quote Reply Posted: 08 Nov 2017 at 2:20pm
	Greetings, My problem is: Whenever I plug a 3 pin fan on the AB350M Pro4 (CHA_FAN1 or CHA_FAN2) it gets crazy, up and down, with peaks of 50.000 rpm. I know that cannot get same control from a 3 pin fan than from a 4 pin, but that speed is too much, it stays at +-3.000rpm with peaks of 50.000rpm and I checked these numbers on UEFI, Aida64, Speedfan, HWiNFO64, etc I updated UEFI to 3.10, I load UEFI default, I changed the customize valors for chassis fan on UEFI. But always same result. I cannot plug any 3 pin fan because it's gonna break and it is very noisy. What can I do? Thanks.