Asrock B450m Pro4 no PWM after reboot
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=17063
Printed Date: 10 Feb 2025 at 11:05pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Asrock B450m Pro4 no PWM after reboot
Posted By: blizzet
Subject: Asrock B450m Pro4 no PWM after reboot
Date Posted: 25 Oct 2020 at 11:21pm
Hi,
Using the Aerocool Duo One casw with my B450m Pro4 board and I have problems with PWM control of the case 4 case fans. This case is delivered with and a argb/fan controller and 4 6pin fans that connects to the fan header and the argb header on the motherboard.
The onlye problem I have is that it works as it should inside bios. If I choose PWM all the profiles works. But as soon as I save and reboot from bios they get back to full speed.
Initially I was on bios 3.90. I have also tried 3.60, and 3.50. No difference. I have also cleared CMOS, and I have tried all fan headers including CPU_FAN2. Going up in bios is as you all know not recommended.
What else is there to try? What is most likely, motherboard or fan controller issue? Or some incompatiblity. Should mention also that DC does not work at all.
Thanks!
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Replies:
Posted By: blizzet
Date Posted: 27 Oct 2020 at 10:16pm
I can add that connecting a single pwm fan directly to the motherboard works perfectly.
So the headers on the board are not the problem.
And the fan hub does work from bios, so probably that is not faulty either.
I have cleared CMOS, downgraded bios to 3.50 since I run ryzen 2600. But no change in behavior.
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Posted By: iPLAY
Date Posted: 02 Jan 2021 at 8:47pm
I have the same problem and I have tried everything like you (bios update etc.), without success.
A friend has the same case, but he has the MSI B550 Tomahawk Mainboard. He has no problem.
My Spec: ASRock B450M Pro4 (BIOS v2.0), Ryzen 2600, Alpha TG Case https://www.tecware.co/alphatg
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