AMD Motherboards - Fan headers auto-detect ?

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Fan headers auto-detect ?

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=13184
Printed Date: 07 Aug 2025 at 7:19am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Fan headers auto-detect ?

Posted By: johmut
Subject: Fan headers auto-detect ?
Date Posted: 17 Dec 2019 at 3:04pm

Hi,
I have a X570 mini ITX TB3 Phantom Gaming motherboard and an NZXT H210i case. I have connected the case fans (3-pin Aero F120 'case' edition) to the MB headers CPU_FAN2 and CHA_FAN3, the AIO is connected to CPU_FAN1.
The top case fan RPM (when tested) can be controlled. The back case fan's not (much) ? Are the MB headers auto-detecting ? Since the fans are 3-pin, I suppose they can only be DC controlled. Should I change this in BIOS ?
Thx & KR

Replies:

Posted By: johmut
Date Posted: 20 Dec 2019 at 4:01am

OK, my bad, they are auto-detect as shown in the BIOS. It looks like one my case fans is running at fixed speed, regardless of DC or PWM mode selected. Perhaps for the best, then there is always air flow through the case.