AMD Motherboards - X470 Case Fan Curious Behavior

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X470 Case Fan Curious Behavior

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=12194
Printed Date: 30 Jul 2025 at 5:40am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: X470 Case Fan Curious Behavior

Posted By: butchboy
Subject: X470 Case Fan Curious Behavior
Date Posted: 14 Aug 2019 at 4:22am

I am seeing unexpected, but welcomed behavior with my non-pwm case fans (Corsair AF120 LED 3-pin). I have them connected to the X470 Taichi Case_Fan2 port and expected them to be spinning at 100% all the time. However, it seems that I can control them with Asrock's A-Tuning. As I play with the fan curve, the speed of the fans increase/decrease accordingly and the fan's LEDs get brighter/dimmer as well.

Was I mistaken believing that a 3-pin fan's power is fixed?

Replies:

Posted By: butchboy
Date Posted: 14 Aug 2019 at 4:29am

HA. Google is my friend. I guess the Taichi x470 MB can regulate the voltage of the case fan ports, and thus control the speeds of the 3-pin fans.