Problem with 3 pin fans

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   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.

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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 Topic: Problem with 3 pin fans 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.

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 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