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How to connect 3 Noctua NF A12x25 Fan to one mobo header?

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mhweb 1 month ago

If I was going to buy 3 Noctua NF A12x25 Fans to a radiator, how to do I connect these fans to only one fan header in the motherboard? I'm currently using the enermax liquitech tr4 2 and one of the fans includes an splitter to connect the 3 fans together, but each Noctua fans come with one splitter for 2 fans, so how do i connect 3 fans to one fan header?


Comments Sorted by:

Gilroar 1 Build 1 point 1 month ago

If they are the 4-pin PWM version get a powered PWM fan hub so they can be properly controlled.

If they are the three pin splitters may work but depending on the board you can overdraw the header using three fans and burn it out or undersupply the fans with power and they don't cool properly.

Shakaron 7 Builds 1 point 1 month ago

Since these are PWM fans, I would use something, like the EK-Cable Splitter 4-Fan PWM Extended.

The point is (as Gilroar) already mentioned, that you don't want all 3 fans being powered by the same motherboard connector as they could overload it. The above example of PWM cable splitter only takes the PWM signal and returns the tachometer to the motherboard connector. The power comes from an external source (MOLEX connector), that can take more load than the motherboard's fan connector.

This allows all of these fans to be controlled by the same motherboard connector. If you have more fans (e.g. 2 - 3 radiators all having their own set of fans) and you want them all to have the same speed, then a fan controller would be a better option. Or, there are cable splitters with an external source that can support way more than 3-4 fans (e.g. 10).

mack_au 4 Builds 1 point 1 month ago

You should not do three fans on a single header.

_Roller_ 2 points 1 month ago

Depends on the voltage/amperage of the fans and what the header can handle. If the fans are rated at a max of 0.2-0.3 amps each and the motherboard can handle 1 amp, should be fine. I have three Noctua Industrial 3000 rpm fans running on one header via a fan hub and it's been fine.

mhweb submitter 1 point 1 month ago

As far as I can tell from the X399 ASRock Taichi motherboard the CPU_FAN1 is rated for 1 AMP and the Noctua fans are rated max current of 0,14 AMP.

From the mobo manual: "The CPU Fan Connector supports the CPU fan of maximum 1A (12W) fan power. "