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Cpu fan into psu or mobo?

Last response: in Components
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June 28, 2011 1:10:28 AM

My CPU cooler is a bit weird and I have three power connectors for it. Anyway, I've ran out of connectors on the mobo but I have an adapter for the psu. Now I'm wondering: does the fan go faster if connected directly into the psu? Thanks.

Also, does it make a difference if I plug one of the CPU fans into the chassis fan port instead of the CPU fan port on the motherboard?

More about : cpu fan psu mobo

a c 90 ) Power supply
a c 102 à CPUs
June 28, 2011 2:55:21 AM

The CPU fan must be plugged into the CPU_Fan header on the motherboard. During POST it looks for this in order to protect the CPU from overheating. You may plug in other fans directly to the PSU and daisy-chain them if desired, but not the CPU fan. The mobo will control the speed of this fan as necessary.
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June 28, 2011 3:30:01 AM

So you're saying that if I plug the fan into the psu directly, it'll always spin at the maximum speed?
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June 28, 2011 3:32:27 AM

toiletninja said:
So you're saying that if I plug the fan into the psu directly, it'll always spin at the maximum speed?

No, it will spin according to how hot your processor gets, assuming your motherboard supports fan control, which it should.
So at high load, it will spin faster for more cooling.
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a c 90 ) Power supply
a c 102 à CPUs
June 28, 2011 3:54:57 AM

toiletninja said:
So you're saying that if I plug the fan into the psu directly, it'll always spin at the maximum speed?

I am saying plug it into the motherboard header named "CPU_Fan" - or else, the motherboard has no way of recognizing the presence of such a fan to cool the CPU. And yes, any fan plugged in directly to the PSU will run at full speed; 100%.

Fans plugged into mobo fan headers can be controlled by the mobo to a set speed profile, by settings in the BIOS. The User Manual will explain this well.
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June 28, 2011 4:01:55 AM

dragonic2020 said:
No, it will spin according to how hot your processor gets, assuming your motherboard supports fan control, which it should.
So at high load, it will spin faster for more cooling.


I'll assume that happens if I connected it directly to the mobo, not the psu.

Anyway thanks.


Ubrales said:
I am saying plug it into the motherboard header named "CPU_Fan" - or else, the motherboard has no way of recognizing the presence of such a fan to cool the CPU. And yes, any fan plugged in directly to the PSU will run at full speed; 100%.

Fans plugged into mobo fan headers can be controlled by the mobo to a set speed profile, by settings in the BIOS. The User Manual will explain this well.


I have three power connectors for my cooler. This is what I have: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I connected two of the seemingly more important ones to the mobo then I ran out of ports, so I connected the last one directly to the psu.
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a c 90 ) Power supply
a c 102 à CPUs
June 28, 2011 4:04:24 AM

toiletninja said:
I'll assume that happens if I connected it directly to the mobo, not the psu.

Anyway thanks.

That is what I said all along!
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June 28, 2011 4:06:36 AM

Best answer selected by toiletninja.
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a c 90 ) Power supply
a c 102 à CPUs
June 28, 2011 4:10:47 AM

Thank you!
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