X370 taichi chassis fan header

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   I made the changes on CHA_FAN3 in the UEFI under HW Monitor but the fan only runs at nearly 100% all the time. 
I tried all settings including Custom. 
The CHA_FAN1-2 can change the fan speed differently.

Please help.

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meinoob Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 06 Aug 2017 Status: Offline Points: 3	Post Options Post Reply Quote meinoob Report Post Thanks(0) Quote Reply Topic: X370 taichi chassis fan header Posted: 13 Oct 2017 at 7:24pm
	I made the changes on CHA_FAN3 in the UEFI under HW Monitor but the fan only runs at nearly 100% all the time. I tried all settings including Custom. The CHA_FAN1-2 can change the fan speed differently. Please help.

parsec Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 04 May 2015 Location: USA Status: Offline Points: 4996	Post Options Post Reply Quote parsec Report Post Thanks(0) Quote Reply Posted: 17 Oct 2017 at 7:02pm
	If you are using a three pin fan on the Chassis3 fan header, you must set the CHA_FAN3 to DC mode, or it will run at full speed all the time. According to the information on the page below, you can configure the CHA_FAN3 header to either PWM mode for a four pin fan, or DC mode for a three pin fan. Just click on "Which fan type can I use on AM4 motherboard to support fan speed control?" : http://www.asrock.com/microsite/AM4TSD/