CPU_FAN_ vs CPU_OPT headers on Asus X99-AII mobo

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eco_bach

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Oct 18, 2015
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As a novice builder somewhat confused by all the various fan headers on my mobo.
Am I correct in assuming that ONLY the CPU_FAN header has PWM signal capability?

Or is each mobo different?

And what is the difference between the PUMP and CPU_OPT headers?
 
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lumineZ
When it comes to fan headers its pretty simple and straight forward :)

3-PIN fan header = No PWM
4-PIN fan header = PWM

The PUMP header has an higher amp rating than CPU_OPT so you can run high current fans, AIO`s or an D5 / DDC pump from it.

The CPU_OPT also reads from the CPU temprature probe as default and whatever you have plugged into that one should / will make the fan / pump go up and down in RPM depending on the CPU temprature.
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lumineZ

lumineZ

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Jul 25, 2017
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When it comes to fan headers its pretty simple and straight forward :)

3-PIN fan header = No PWM
4-PIN fan header = PWM

The PUMP header has an higher amp rating than CPU_OPT so you can run high current fans, AIO`s or an D5 / DDC pump from it.

The CPU_OPT also reads from the CPU temprature probe as default and whatever you have plugged into that one should / will make the fan / pump go up and down in RPM depending on the CPU temprature.
 
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