Question How to separate controls for pwm fan and non pwm fan?

[expoodo]

I have a non pwm fan and a pwm fan connected to my motherboard. Problem is, I can't control them individually though the bios or through software. When the non pwm is at its most effective rpm, the pwm fan sounds like a jet engine. Is there any way to fix this? Both fans are connected by their own 4 pin header. Thanks

motherboard: ASUS M5A97 R2.0
OS: Linux (Ubuntu)

 

[Lutfij]

Welcome to the forums, newcomer!

You have a PWM hub that caters to PWM fans what's hooked up to a PWM fan header on the motherboard. You isolate 3pin DC fans on a splitter/hub and regulate in BIOS or app in OS.

 

[expoodo]

Welcome to the forums, newcomer!

You have a PWM hub that caters to PWM fans what's hooked up to a PWM fan header on the motherboard. You isolate 3pin DC fans on a splitter/hub and regulate in BIOS or app in OS.

I don't get what you mean by using a splitter/hub, can you clarify? Thanks

 

[CountMike]

I have a non pwm fan and a pwm fan connected to my motherboard. Problem is, I can't control them individually though the bios or through software. When the non pwm is at its most effective rpm, the pwm fan sounds like a jet engine. Is there any way to fix this? Both fans are connected by their own 4 pin header. Thanks

motherboard: ASUS M5A97 R2.0
OS: Linux (Ubuntu)

Are they both connected to same header on the motherboard ?

 

[SkyNetRising]

I have a non pwm fan and a pwm fan connected to my motherboard.
Problem is, I can't control them individually though the bios or through software.

Check BIOS for options to switch fan control mode from PWM to linear voltage.
If there are no options, then replace 3pin fan with PWM fan.

You can control fan profiles with AI Suite software - Fan Xpert.
This is windows software (not Linux).

 

[Paperdoc]

I'm intrigued. Starting point is this: you can control the speed of an older 3-pin fan ONLY by varying the Voltage supplied to it from Pin #2 of the header. Control of a newer 4-pin PWM fan's speed is done differently. So you cannot MIX those two types on ONE mobo fan header because they require different types of signals.

Now, you say these two actually ARE on different headers. Good! Next, I see from the mobo manual that there is NO mention of this matter of different header signal types. The manual shows 4-pin headers labelled as PWM Mode only, which suggest that it can NOT control the speed of a 3-pin fan. Such a fan should run full speed all the time. HOWEVER, your post also says, "When the non pwm is at its most effective rpm ...", suggesting that somehow you have been able to adjust its speed. HOW?

MANY modern mobos have a configuration option for each header that allows you to specify whether it behaves as an older 3-pin header in Voltage Control Mode (aka DC Mode), or as a new 4-pin header in PWM Mode. When you separate fan types onto different headers, then you use this feature to set the header for 3-pin fans to use Voltage Control Mode, and the other header for 4-pin fans to PWM Mode. Although the manual does not say you have this, is that feature actually there? Is that how you control the speed of the 3-pin fan? If yes, then just ensure each header is set this way.

If I read your first post correctly, you have only TWO fans you are concerned about, and each is on its own mobo header. You do NOT mention having a Fan Hub or a Splitter involved in any connection from fan to mobo. Is that right?