Gigabyte Z97MX CPU_FAN and CPU_OPT voltage control?

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angel11

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Jan 2, 2015
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Hi,

I have recently got a Gigabyte Z97MX Gaming 5 Motherboard and a Noctua NH-U9B SE2 fan, which has a 3-pin fan (not PWM, so they need voltage control). I have configured the BIOS for CPU_FAN and CPU_OPT to perform "SILENT".

When the fan is conected to the CPU_FAN motherboard connector it just goes 1700 rpm all the time (always at max speed). However, when I connect it to the CPU_OPT connector, it slows down and really goes "SILENT" (with its speed increasing when temperature rises).

Why is this happening so? Does the CPU_OPT have voltage fan control while the CPU_FAN doesn't? It seems like they just don't work the same way. So I have my CPU fan connected to the CPU_OPT and the CPU_FAN is empty. Any problems if I do this?

Thank you very much in advance,

Angel
 
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angel11

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Jan 2, 2015
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The only options in BIOS are "silent", "normal", "full speed" or "manual" (which shows different PWM values). The same for CPU_FAN and CPU_OPT.

But CPU_OPT does voltage control with "silent" mode. No other explanation since its a 3-pin fan.
 
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angel11

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Jan 2, 2015
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Could you please show me where you saw it so I can have a look, too? I have already been trying to find that information.

And do you think there is something wrong with the CPU_FAN connector, since I can only control my 3-pin fan from the CPU_OPT?

Thank you for your help :)

 
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zrx8

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Jul 2, 2015
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Hello,

I have also noticed the difference between the pinout of the 4-pin system fan headers and the CPU fan header, but having VCC on pin4 instead of the PWM signal suggests that 4-wire system fans don't even get a speed control from the mobo, which is presumably not the case. Can you please clarify this ? Thanks.
 
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