https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Mon, 06 Apr 2026 21:45:09 +0000 Tue, 06 Jun 2017 11:21:20 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=5313 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=5313&PID=30499&title=z270-taichi-issue-in-pwm#30499 Author: parsec
Subject: 5313
Posted: 06 Jun 2017 at 11:21am

lantony wrote: Hi all, this motherboard is great but I have an issue that i am reading around seems to be common: all the 4pin on the motherboard for fan control are working fine except for the CHA FAN 2 which i cannot use at all in PWM mode. It only works in full speed mode, if i try to set the pwm mode, it get simply disabled. I have read of a couple of guys having issues on PWM mode for cha fan 3. What might be this issue? how to solve it? I am running the latest bios (2.10) thanks

The specifications for the Z270 Taichi state:

 "CPU_OPT/W_PUMP, CHA_FAN1, CHA_FAN2 and CHA_FAN3/W_PUMP can auto detect if 3-pin or 4-pin fan is in use.".

So a four pin PWM fan on the CHA_FAN2 connector should have its speed controlled fine.

The CHA_FAN3 connector must be manually configured with its option in the UEFI/BIOS (Chassis Fan 3 Control Mode), to operate in PWM or DC (three pin voltage control) mode.

What is the full model name and number of the fan you are using on the CHA_FAN2 connector?

Most if not all four pin PWM fans can also have their speed controlled in DC/voltage mode. I have used PWM fans on strictly DC three pin fan connectors, and can control their speeds fine.

I don't have your board, and can only go by the manual, which may not be up to date with UEFI updates.

You said you try to set the CHA_FAN2 connector to PWM mode. How are you doing that? The manual does not show a Control Mode option for the CHA_FAN2 connector.

What fan speed profile are you using for the CHA_FAN2 connector? A custom one or a built in fan speed profile? Have you selected non-default fan speed profiles for the other fan connectors?

You also said if you try to set PWM mode, it gets disabled. I don't understand what you mean by that. What gets disabled?
]]> Tue, 06 Jun 2017 11:21:20 +0000 https://forum.asrock.com/forum_posts.asp?TID=5313&PID=30499&title=z270-taichi-issue-in-pwm#30499 https://forum.asrock.com/forum_posts.asp?TID=5313&PID=30487&title=z270-taichi-issue-in-pwm#30487 Author: lantony
Subject: 5313
Posted: 06 Jun 2017 at 4:23am

Hi all, this motherboard is great but I have an issue that i am reading around seems to be common:

all the 4pin on the motherboard for fan control are working fine except for the CHA FAN 2 which i cannot use at all in PWM mode. It only works in full speed mode, if i try to set the pwm mode, it get simply disabled. I have read of a couple of guys having issues on PWM mode for cha fan 3. What might be this issue? how to solve it?

I am running the latest bios (2.10)
thanks
]]> Tue, 06 Jun 2017 04:23:16 +0000 https://forum.asrock.com/forum_posts.asp?TID=5313&PID=30487&title=z270-taichi-issue-in-pwm#30487