Gigabyte GA 970A DS3P sys fan

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Hello guys, I have looked for the answer on web, but failed to find it. So here it goes. I have the mentioned motherboard. On it, I connected 2 case preinstalled fans (3 pins) NZXT 2V, they are on sys_fan1 and pwr_fan1, working as i wanted them to. The problem is I have tried to connect 2 intake fans from Fractal design (GP-14, 4 pin PWM). On the mobo there is a 4 pin connector sys_fan2. But in the user guide it says, that the 4th pin is just a reserve. So I am looking for a solution, what do u guys recommend. Thanks!
 
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Barty1884

Barty1884

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Not 100% sure what your question is here exactly?

In a very simple sense, a 4pin fan is a 3pin fan + 1 for additional speed/voltage etc control.

A 3 pin fan should work on a 4 pin header (mounted from the left) and additionally, a 4pin fan should also work on a 3pin header (again, aligning to the left).

If you have a 4pin header & a 4pin fan, you've got no issues. I suspect what they mean by "reserve" is it can't always be utilized (don't know for sure that's exactly what they mean though).
 
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Dec 2, 2015
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While the CPU fan header in user guide is described like this. (1st pin: GND, 2nd pin: +12V, 3rd pin: Sense and 4th pin: Speed control) the sys_fan1 4th pin is mentioned as "reserve". And when I power up the rig, the 2 fans attached to the 4pin header don't start. They just "shake" back and forth, like they don' get full 12v to run.
 
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