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Does Anyone Know How To Unlock Fan Speeds?

JakeCharman
By JakeCharman
in Cooling
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Posted

Hi,

 

I'm using a Fujitsu motherboard and case for my testing PC. I would like to be able to change the fan speeds however the speed seems to be locked (OEM perhaps?). SpeedFan recognises the fans but nothing happens when the speed is changed.

 

Any help would be greatly appreciated.

 

Jake

www.jakecharman.co.uk

www.nitrousjuinkie.com

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Posted

Hi,

 

Hey

 

Not all fans support support being changed, only fans with 4 pins or PMW fans support being changed

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Posted

Hi,

 

I'm using a Fujitsu motherboard and case for my testing PC. I would like to be able to change the fan speeds however the speed seems to be locked (OEM perhaps?). SpeedFan recognises the fans but nothing happens when the speed is changed.

 

Any help would be greatly appreciated.

 

Jake

 

Open configure, advanced, look for your motherboard, and change all the PWM settings to manual.  Now close that window and make sure Automatic fan speed is unchecked on the main window.  You should now be able to change your fan speeds.

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Posted

03bf24bbf452e8dc3653b0da0931e280.jpg

 

One does not "unlock" fan speeds...

 

https://en.wikipedia.org/wiki/Computer_fan_control

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Hey

 

Not all fans support support being changed, only fans with 4 pins or PMW fans support being changed

nope you're false, even 3 pins can be changed if the mobo supports reducing voltage on the fan headers

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Posted

Hey

Not all fans support support being changed, only fans with 4 pins or PMW fans support being changed

3 pins or PWM you mean?
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nope you're false, even 3 pins can be changed if the mobo supports reducing voltage on the fan headers

I believe you are correct, but lets be a little nicer about it in the future, alright? :)

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nope you're false, even 3 pins can be changed if the mobo supports reducing voltage on the fan headers

 

Ah sorry, maybe you are right :D

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Posted

Hi

Snip

Any help would be greatly appreciated.

Jake

I've never used that mobo but with my Asus there are settings in the bios to choose dc (3pin) or pwm (4pin) and also settings to create very basic fan profiles or enable manual control

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Posted

3 pins or PWM you mean?

Third pin is nothing but a tachometer.   If the board allows for voltage based control of fan speed then only two pins are even necessary.

 

Otherwise you do need the fourth pin - pulse width speed control.

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Third pin is nothing but a tachometer. If the board allows for voltage based control of fan speed then only two pins are even necessary.

Otherwise you do need the fourth pin - pulse width speed control.

Yeah I know, I was correcting him, two pins are only ever needed
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