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Y-splitter into motherboard CPU fan out? (Push/Pull)

post #1 of 4
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Does anyone know if it's okay to wire two fans with a Y-splitter into the motherboard CPU fan connector, or do they have to be hooked up to a 4-pin from the PSU?
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post #2 of 4
Quote:
Originally Posted by thrillhaus;14278355 
Does anyone know if it's okay to wire two fans with a Y-splitter into the motherboard CPU fan connector, or do they have to be hooked up to a 4-pin from the PSU?

Do not do this. Motherboard headers do not supply a lot of power to begin with. Plugging 2 fans into a motherboard header will either burn out that header rather quickly, or cause other issues.
    
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post #3 of 4
It depends on the motherboard and the amount of power the fans draw e.g. the Asus mobo in my system below supports a power draw of 24W (2A) on the CPU fan header and a maximum of 84W (7A) for the whole board. It's worth checking the mobo manual.
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post #4 of 4
It can be done, buy you need to look up the startup wattage for your fans, and also how much wattage the cpu header is rated for. If the combined startup wattage for the two fans exceeds the rated wattage of your cpu header, you will fry the header.

So unless your sure it can handle it, I wouldnt recommend doing so.

If your trying to have multiple fans speed controlled by your motherboard, try this.
link
It will supply the fans with power using a molex from your power supply, but the pwm wire will go to your motherboard. So you can control up to 3 fans with your cpu header without frying it. Ingenious wink.gif
Edited by AliceInChains - 7/20/11 at 1:37am
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