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Fan header power rating

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Nereus
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2017/04/08 15:59:22 (permalink)
Hey. I'm installing an ASUS Maximus IX Hero Z270 mobo right now. I need one more fan header for a tiny little 40mm fan. I have one free fan header on the board, but rather than being rated like the other case fan headers as Max Current 1A, Max Power 12W, this one free header is rated at Max Current 3A, Max Power 36W. All fan headers are 4 pin headers btw.
 
Does that higher header rating mean the low powered 3-pin 40mm fan will burst into flames when I plug it in there, or is that just a maximum so I can plug in heavy duty fans there if I wish, but it's not going to overload a low powered fan? 
 
The 40mm fan is rated 12V, 0.4W, 0.05A.
 
Thanks in advance.
 
p.s.  yes I know, ASUS board, EVGA forum, but I'm not registered on wherever their forums are yet.
 
 
 
 
 


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    ty_ger07
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    Re: Fan header power rating 2017/04/08 16:12:01 (permalink)
    That is the rated max power of the header. It will not cause your small fan to be damaged. Electricity doesn't work that way. Think of it like your power supply; just because you buy and install a 1200 watt power supply doesn't make your computer consume 1200 watts and catch fire when it is trying to idle at 100 watts.

    E=IR and P=IE. E (volts) = I (amps) * R (ohms). P (watts) = I (amps) * E (volts). The fan will only draw the power it needs and cannot be forced to consume extra power unless you increase the voltage.
    post edited by ty_ger07 - 2017/04/08 16:15:03

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    Nereus
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    Re: Fan header power rating 2017/04/08 16:47:10 (permalink)
     
    Thanks, just wanted to be sure :)
     
     


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