Question how do i change the speed of a 3 pin fan

aidanwright24

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Jan 3, 2019
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I know you have to change the voltage for the fans to change speeds but how. i only have 2 headers (1 3pin 1 4pin) do i need a controller? can i use bios or software?
 

aidanwright24

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What motherboard do you have? Its been a long time since I've seen a motherboard with a 3 pin fan header, they are all 4pin PWM nowadays

But yes in the BIOS you should be able to set the fan curve for each header.
Ab350m (not pro4 or anything) and when im in the bios i can only change chassis fan 1 which is the pwm one and not the 3 pin from what i can see
 

aidanwright24

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Jan 3, 2019
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Make sure the other fan is in DC/ Voltage mode and not Auto or PWM. That should allow you to change the fan curve then.
Only problem is i dont see anyway of accessing the 3pin fan settings.

In the H/W Monitor it has usual cpu temp, mobo temp and all that then it says chassis fan 1 speed at 1200rpm (the pwm header) then chassis fan 2 speed at 1500rpm (3 pin) then it says a bunch of voltage things below that but i cant interact with them. The only things it lets me change with the fans are the cpu fan, chassis fan 1, over temp protection and open case feature
 

aidanwright24

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Jan 3, 2019
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aidanwright24

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Jan 3, 2019
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Do you think i could return the fans i bought and get pwm fans instead (i got them on saturday)pwm just seems so much easier and straight forward
 

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