Question 3 pin chassis fans - power supply and automatic fan speed

Neutr1no

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Jun 15, 2014
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Currently I have 3x 3-pin fans connected to a built-in chassis controller that's powered through SATA. Fans are controlled manually by a switch on the chassis itself.

To automate this, I'd like to connect those fans to a motherboard using PWM Y splitter. But do I need to power up those fans somehow? Or is it powered via mobo?

Additionally, can mobo automatically control fan speed if they are only 3-pin?

I have Asus Tuf Gaming X570 motherboard if that matters.
 
Currently I have 3x 3-pin fans connected to a built-in chassis controller that's powered through SATA. Fans are controlled manually by a switch on the chassis itself.

To automate this, I'd like to connect those fans to a motherboard using PWM Y splitter. But do I need to power up those fans somehow? Or is it powered via mobo?

Additionally, can mobo automatically control fan speed if they are only 3-pin?

I have Asus Ruf Gaming X570 motherboard if that matters.
If you plug them in the MB's headers no other power is needed.
 

Neutr1no

Honorable
Jun 15, 2014
6
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10,510
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I see, thanks.

And regarding automatic control - motherboard's manual says:
3x Chassis Fan connectors (4-pin) for both 3-pin (DC mode) and 4-pin (PWM mode) coolers control
So I assume automatic control is indeed possible? But does it matter if I plugin in 3-pin or 4-pin connector to the motherboard?
 

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