Intel Motherboards - Control 3 pins fan with BIOS

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Control 3 pins fan with BIOS

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=5983
Printed Date: 29 Jul 2025 at 12:43pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Control 3 pins fan with BIOS

Posted By: Guysmo
Subject: Control 3 pins fan with BIOS
Date Posted: 04 Sep 2017 at 12:07am

" rel="nofollow - Hi,

I bought an ASROCK B250 PRO4 and I'm trying to control all fans, they all have 3 pins.
In BIOS, I found the menu to set silent or full speed mode but in any cases, fan speed doesn't change !
If it's not possible with BIOS, which software can do that ? (speedfan doesn't work)

Thank you for your time.

Replies:

Posted By: ASRock_TSD
Date Posted: 08 Sep 2017 at 5:47pm

Dear Guysmo,

Thank you for choosing ASRock.

Regarding your case, B250 Pro4 has 3 chassis fan, chassis fan2 and chassis fan3 can support 3-pin fan.

Chassis fan 2 can auto detect if 3-pin or 4-pin fan is in use.

Chassis fan 3 have to set to DC mode in BIOS, after setting to DC mode, 3 pin fan speed can be controlled.

http://www.asrock.com/mb/Intel/B250%20Pro4/index.asp#Specification" rel="nofollow - http://www.asrock.com/mb/Intel/B250%20Pro4/index.asp#Specification

Thank you!

Yours truly,

ASRock TSD

Posted By: Guysmo
Date Posted: 08 Sep 2017 at 8:11pm

I didn't know it's possible to switch to DC mode.

I will try it.

Thanks :)