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Problem with 3 pin fans

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Johusan View Drop Down

Joined: 25 Jun 2017
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    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.

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ASRock_TSD View Drop Down

Joined: 20 Mar 2015
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Points: 8247
Post Options Post Options   Thanks (0) Thanks(0)   Quote ASRock_TSD Quote  Post ReplyReply Direct Link To This Post 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)
2. Please re-flash BIOS P3.10 again.
3. If possible, please change another 3-pin fan for verifying.
4. If possible, please install the fan to another system for verifying.


All the best,

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