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Windows 7: How many folks here have 4-pin case fans?

08 Dec 2014   #11
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Yep. You're right. When in doubt, read the manual!

So maybe Q-fan is working the fans?

Plugging a 3-pin fan into the CHA_FAN header covers the GND - CHA FAN PWR - CHA FAN IN pins.
The +5v pin is free.
So can Q-fan control the speed through voltage?

If you plug a 4-pin fan into one of these headers, what happens? Anything to gain?


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08 Dec 2014   #12
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Quote   Quote: Originally Posted by TVeblen View Post

If you plug a 4-pin fan into one of these headers, what happens? Anything to gain?
Dunno in your case, but I've read in the last week that not all 4 pin fan headers are created equally. They aren't standardized and you'd just have to experiment. The 4th pin may do this or that, or may be a dummy. That's on the motherboard side. For all I know, the fans themselves are equally confusing.
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08 Dec 2014   #13
GeneO

Windows 10 Pro. EFI boot partition, full EFI boot
 
 

Quote   Quote: Originally Posted by TVeblen View Post
Yep. You're right. When in doubt, read the manual!

So maybe Q-fan is working the fans?

Plugging a 3-pin fan into the CHA_FAN header covers the GND - CHA FAN PWR - CHA FAN IN pins.
The +5v pin is free.
So can Q-fan control the speed through voltage?

If you plug a 4-pin fan into one of these headers, what happens? Anything to gain?
The +5v on the pin runs the PWM fan at full speed (though it isn't really necessary, plugging it into a 3 pin header will do the same - don't know why they have it as 4 pin except maybe to be able to claim it is 4-pin). Its speed can be controlled by voltage on the voltage pin by Q-fan. It has no advantage over a 3 pin fan though.
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08 Dec 2014   #14
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

I know the fans run on 12v normally. Perhaps the 5v is what is used to modulate the speed ramp up? Just guessing now.

Interesting though. Never thought of any of this until now!
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08 Dec 2014   #15
GeneO

Windows 10 Pro. EFI boot partition, full EFI boot
 
 

Quote   Quote: Originally Posted by TVeblen View Post
I know the fans run on 12v normally. Perhaps the 5v is what is used to modulate the speed ramp up? Just guessing now.

Interesting though. Never thought of any of this until now!
Yes it is. A constant DC 5v is 100% duty cycle yielding full speed. But also, if there is no voltage on the pin (like plugging into a 3 pin header), the PWWM fan will run full speed. IDK, maybe there are some PWM fans out there that need that 5V to run at full speed. I haven't come across any though.

-
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09 Dec 2014   #16
NoN

Windows 7 Professional SP1 - x64 [Non-UEFI Boot]
 
 

My motherboard have 4 of those, 4pin PWM headers. Apart the CPU header, 2 i choosed to go 4pin PWM Fans, the last one is plugged with a 3pin Fan 200mm sized sided fan. The all lot is monitored by AI Suite II.

Otherwise i'm using a Fan Controller bay 5,25" for 4 of 140mm Fans and 1 slim 120mm Fan. I'm close near a jet plane sound at full speed!!!
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09 Dec 2014   #17
GeneO

Windows 10 Pro. EFI boot partition, full EFI boot
 
 

Quote   Quote: Originally Posted by NoN View Post
My motherboard have 4 of those, 4pin PWM headers. Apart the CPU header, 2 i choosed to go 4pin PWM Fans, the last one is plugged with a 3pin Fan 200mm sized sided fan. The all lot is monitored by AI Suite II.

Otherwise i'm using a Fan Controller bay 5,25" for 4 of 140mm Fans and 1 slim 120mm Fan. I'm close near a jet plane sound at full speed!!!
Are you sure they are PWM? They may be only voltage controlled with 4 pins. I woulsd suspect the chasis 4-pins are not PWM.
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09 Dec 2014   #18
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

On my Asus board the four 4-pin chassis headers are not PWM.
They are GND | CHA FAN PWR | CHA FAN IN | +5v .
The CPU header is PWM. Got a CPU-Optional header that is PWM too.
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10 Dec 2014   #19
NoN

Windows 7 Professional SP1 - x64 [Non-UEFI Boot]
 
 

Quote   Quote: Originally Posted by GeneO View Post
Quote   Quote: Originally Posted by NoN View Post
My motherboard have 4 of those, 4pin PWM headers. Apart the CPU header, 2 i choosed to go 4pin PWM Fans, the last one is plugged with a 3pin Fan 200mm sized sided fan. The all lot is monitored by AI Suite II.

Otherwise i'm using a Fan Controller bay 5,25" for 4 of 140mm Fans and 1 slim 120mm Fan. I'm close near a jet plane sound at full speed!!!
Are you sure they are PWM? They may be only voltage controlled with 4 pins. I woulsd suspect the chasis 4-pins are not PWM.
I think so...they all are tagged PWM (See attached Pic) taken from my Asus motherboard manual instruction.

The CPU_Fan is max 1A (12V)


Attached Thumbnails
How many folks here have 4-pin case fans?-capture.png  
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10 Dec 2014   #20
GeneO

Windows 10 Pro. EFI boot partition, full EFI boot
 
 

Yep, looks like they are. Very few boards have all PWM.
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 How many folks here have 4-pin case fans?




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