AMD Motherboards - B450m4 fan problem,

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B450m4 fan problem,

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=12429
Printed Date: 05 Feb 2025 at 4:53pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: B450m4 fan problem,

Posted By: Lezion
Subject: B450m4 fan problem,
Date Posted: 13 Sep 2019 at 7:38am

Hi, I'm finishing my server build that uses B450m board with 2700 ryzen in it. I am having a trouble setting up the cooling. I've got custom fan solution with 6 fans running in parallel power straight from 12 rail on psi. They are pwm controlled. Here is the problem, when I am in the bios, and I am setting up the fan curve they respond to the changes corrected. They are connected to fan header 3, with pwm control mode and fan speed set to custom in the bios. But as soon as I click save changes and do the restart, they are back at 100% speed. If I go back to bios, it looks like the setting have been applied but fans are at 100%. As soon as I click one of the fan options they go slow down to the normal speed. No matter what I do as soon as I do that restart fans are 100 speed again. Any ideas?