connect 3 pwm fans to one mobo pwm connector. .24A each = 0.72 safe?

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ajdoong

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Aug 14, 2015
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So I've got 3 Arctic F12 PWM PST fans (0.24A) that i want to connect onto one mobo pwm header under CHA_FAN4. (No, i dont want to split them onto the others channels, those are occupied.) Arctic's website states:

"Typical Voltage: 12V DC
Start-up Voltage: 6.0V DC (@ 100% PWM)"

Will it be safe to connect all three pwm fans to one header? 0.24*3=0.72A, since it has a constant 12V , and the startup/rampup seems to be safe?
 
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MarkW

MarkW

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Dec 7, 2009
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Are you trying to create hurricanes inside your case or cool it?

Three chassis fans is all that is normally needed or wanted. Two at the front pulling in cool air, and one at the rear pulling warm air out. Almost anything else disrupts the natural flow of air that the three fan setup creates, which leaves a very good chance of hot spots.
 
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ajdoong

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Aug 14, 2015
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I'd like hurricanes. I'd really like an answer to my question, but since you're wondering, I'm running 2 fans in front, 2 fans on bottom, 3 fans on top, and 1 140xl radiator in back.
 
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ajdoong

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Aug 14, 2015
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so the question was,

"Will it be safe to connect all three pwm fans to one header? 0.24*3=0.72A, since it has a constant 12V , and the startup/rampup seems to be safe?"

anyone have an answer?
 
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Karadjgne

Karadjgne

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Dec 26, 2012
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No. What arctic hasn't posted is starting amps. It's the initial draw indicative to every motor on the planet. While it may not be much, even an additional 0.05a is going to put you at 0.87a and you are totally relying on a full 1.0a at the header. While 1.0a is the general concensus, reality is someone's can vary, some of the cheaper boards only carrying 0.8a on the headers. 2 fans would easily be safe, but 3 would be pushing your luck at 0.24a. 0.66 is about as high as you'd normally be recommended. It's your call, but considering the price of a fan vrs the price of a mobo, it not really worth the risk.

What you could do is cheat the header. Hook the 12v power to a molex or Sata connector and pwm/tach to the header.
 
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