Connecting a case fan to the motherboard

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IMTECH

IMTECH

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Aug 10, 2013
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I have a Cooler Master HAF 932 case and a MSI GD65 Gaming motherboard. Since the case has 3 fans and motherboard only has 2 connectors for systems fans, is it alright to connect the 3rd case fan to the CPU cooler pin on the motherboard. Will it somehow affect the cooling of the CPU since a CPU cooler is already connected to the other pin?

I can connect the 3rd fan directly to the PSU but it's too loud then. I'd prefer to connect it to the motherboard mainly because the speed of fans is maintained automatically.

Thanks in advance.
 
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IMTECH

IMTECH

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Aug 10, 2013
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I don't know why this hasn't occurred to me because I'm using the exact same thing for my CPU cooler (it has 2 fans). I was absent minded I guess...

Thank you anyway.

I'd still like to hear the answer to the question above - if I connect it to the CPU Cooler pin, will it work properly and will it affect the cooling of the CPU in any way?

 
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noob222

noob222

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Apr 3, 2014
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I have no clue. I have not ever tried it personally. My educated guess would be that it would not affect your CPU cooling fan at all. The case fan would just rev when your CPU fan did. Like I said though it's just a guess.
 
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volcanoscout

volcanoscout

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Jan 5, 2014
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That's a PWM fan header that's slaved to the CPU Fan header. Whatever's connected to the CPU Fan 2 header is just going to copy whatever the fans on CPU Fan1 are doing. It's controlled as a percentage of the RPM duty cycle, so if the mobo is sending a signal to run at 75% the fans on each of those headers will run at 75%, even if that means a different RPM for each in the case of fans that are different sizes or have different RPM capabilities.

If it works similar to Asus boards, in the BIOS you can tell the mobo whether the connected fans are PWM or not. If they're PWM, they're controlled via the PWM signal on the fourth pin. If they're non-PWM, the board will control them by changing the voltage going to the fans. If PWM control is selected, any 3-pin non-PWM fans connected to either CPU fan header is going to run full time at 100%.
 
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