Intel Motherboards - Understanding FAN speed/control

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Understanding FAN speed/control

Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=13885
Printed Date: 04 Aug 2025 at 7:47am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Understanding FAN speed/control

Posted By: Dice
Subject: Understanding FAN speed/control
Date Posted: 20 Mar 2020 at 8:05pm

Hello,

Motherboard: asrock z390m-itx/ac

I recently added two noctua fans in the bottom of my case. I entered my bios to confirm they were detected and working. I have played with the system for a day of two and everything works as it should

For some reason I wanted to see what the Fan Turning option did and didnt realize it said - Detect the lowest fan speed in the system - in the description.

The system did a - Detecting your fan speed - and I had to wait.
When it was finished it said:
Cpu fan 1 minimal duty = 20%
Chassie fan 1 minimal duty = 25%
Chassie fan 2 minimal duty = 20%
Can someone explain what this means?

Ever since I pressed that option I have noticed my PC generates more noise, even at idle! Now, it annoys me that I can hear it compared to before!
I have pressed the Load default uefi setting and it still does it.
All of the fans er set to standard.

My FAN setting:
CPU FAN 1 Setting - Standard mode

CHA_FAN1 /W_PUMP Switch - CHA_FAN1
Chassis FAN 1 Control Mode - Auto
Chassis Fan 1 Setting - Standard Mode
Chassis Fan 1 Temp Source - Monitor M/B

Chassis Fan 2 setting - Standard Mode
Chassis Fan 2 Temp Source - Monitor M/B

CPU temp at IDLE is 48C and Motherboard at 43C

I wonder i the person before me did a fine tune of the system but I?�?pretty sure everything was at default /stock.