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CHA_FAN2 cannot control

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Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
Printed Date: 20 Apr 2024 at 10:34pm
Software Version: Web Wiz Forums 12.04 -

Topic: CHA_FAN2 cannot control
Posted By: Adelos
Subject: CHA_FAN2 cannot control
Date Posted: 25 Jul 2019 at 4:46pm
Hello, I have a question about my chassis fan of X470 itx/ac board.
When I connect the same 2 3-pin chassis fan on chassis fan1 and 2, but only fan1 can control the speed.
The other seems like only high speed.
Is there any way I can control it on chassis fan2 too?
If yes, please advise, thank you in advance.

Posted By: paologab
Date Posted: 25 Jul 2019 at 5:17pm
go in the bios, h/w monitor and scroll down.
ON cha_fan2 click on auto, than you can choose some profile like silence, performance,... or customize. You can choose also the control DC or PWM.
Try what fit you.
Then you can also shape the curve below those settings.

AMD Ryzen 7 2700X w/Wraith prism
x470 Taichi bios 3.50
16gb HX432C16PB3K2/16 (hynix H5AN8G8NCJR-UHC)
AMD Radeon RX 580 8G OC
Linux Kernel 5.4
Manjaro Stable XFCE

Posted By: ASRock_TSD
Date Posted: 25 Jul 2019 at 6:59pm
Dear faC645lB,

Greetings, this is ASRock TSD.

About the Chassis fan, Fatal1ty X470 Gaming-ITX/ac supports Smart Fan Speed Control on CHA_FAN1.

So only CHA_FAN1 can auto detect if 3-pin or 4-pin fan is in use.

If installing 3-pin fan on CHA_FAN2, it will work at full speed.

Please refer to the following specification.


All the best,

Posted By: Adelos
Date Posted: 30 Jul 2019 at 5:17pm
Understood, i will use 4-pin fan instead.
Thank you.

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