Intel Motherboards - Gaming-ITX/ac fan control not working

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Gaming-ITX/ac fan control not working

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=1908
Printed Date: 19 May 2024 at 8:42pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Gaming-ITX/ac fan control not working

Posted By: x6phenom
Subject: Gaming-ITX/ac fan control not working
Date Posted: 02 Feb 2016 at 10:05pm

Hello,

I have three fans:
SYS
CPU
AUX

I am able to control CPU and AUX, but not SYS. Is this intended or a fault in the motherboard?

I opened my chassis to see which header corresponds to which signal:

CPU_FAN1 = CPU (can control)
CHA_FAN1 = AUX (can control)
CHA_FAN2 = SYS (control not working)

What should I do? Is this a BIOS or HW fault?

I used both SpeedFan and F-Stream to test.

Replies:

Posted By: x6phenom
Date Posted: 02 Feb 2016 at 11:03pm

Updated from BIOS 1.7 to 1.8

SYS / CHA_FAN2: control still not working

Posted By: tmorris
Date Posted: 03 Feb 2016 at 1:35am

I ran into the same issue. Are you using 3-pin or 4-pin (PWM) fans. I found that the CHA_FAN2 pin ran at full speed for voltage but worked if using a PWM fan. Then I found this in the on-line specifications:

"CPU_FAN1 and CHA_FAN1 can auto detect if 3-pin or 4-pin fan is in use."

I think the first two can do both but the third can only control a PWM fan.

Posted By: x6phenom
Date Posted: 03 Feb 2016 at 3:38am

All three are 3 pin connectors. Its so weird.. why would they even do this? I had to move my radiator fans to CPU_FAN and CHA_FAN1 and move my pump head connecter to the CHA_FAN2 (which doesnt control and runs at max always).

The problem is configuring fan profiles in BIOS. Since CPU_FAN1 responds to ? (CPU temp presumably) and the CHA_FAN1 can be configured for either motherboard or CPU. But when I set simialar fan profile settings, the CPU_FAN1 is always running at a lower speed than the CHA_FAN1 (no matter if I make it respond to motherboard or CPU temp).

It as pretty frustrating, eventually gave up and decided to use SpeedFan.