AMD Motherboards - Custom fan curve on B450M Pro4 doesn't work?

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Custom fan curve on B450M Pro4 doesn't work?

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=10120
Printed Date: 23 Jul 2025 at 12:19am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Custom fan curve on B450M Pro4 doesn't work?

Posted By: daclaydog
Subject: Custom fan curve on B450M Pro4 doesn't work?
Date Posted: 10 Nov 2018 at 10:31pm

I have a custom fan curve set in the BIOS (v1.50), but it doesn't seem to ramp up fan speed as the CPU temperature increases:

As you can see, the CPU fan speed doesn't change.

What am I missing? I only installed A-tuning to get the screenshot, and would prefer to have this work without having to use it.

[edit] lol, there are too many sticky threads on this forum - I just noticed another thread on Page 2 that CPU temperature detection is broken, and to use tCtrl instead.

~~However, that isn't available in the BIOS, and~~ I don't want to use A-tuning as it requires my account have administrator privileges (a big security risk).

[edit 2] nvm, I was only looking at the Fan Tuning section. It's possible to select Tctrl as the temperature source in the section where you type in temperatures and percentages.