AMD Motherboards - B550 Phantom ITX/ax CPU Fan Speed

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B550 Phantom ITX/ax CPU Fan Speed

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=17876
Printed Date: 09 Aug 2025 at 5:12pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: B550 Phantom ITX/ax CPU Fan Speed

Posted By: Lupercal
Subject: B550 Phantom ITX/ax CPU Fan Speed
Date Posted: 23 Jan 2021 at 5:08am

I just upgraded my system from an ab350 itx to a B550 Phantom Gaming ITX/ax. My issue is that the new motherboard can't seem to detect or control my CPU fan speed. Doesn't seem to matter what fan header it's plugged into or what fan settings I change in BIOS. This, of course is resulting in the CPU temps get pretty warm while doing anything even moderately intensive.

I'm on BIOS 1.8, and the fan is a Noctua NF-A9x14 PWM.

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B550 Phantom Gaming Itx/ax
AMD Ryzen 7 3700x
2 x 16GB Ballistix Sport 3200
1Tb SK Hynix + 512GB XPG Gammix