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z270 FTW K + Noctua NH-D14 = constant fan speed

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newbie_ftw
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2017/02/24 12:39:29 (permalink)
Using bios defaults, which specify variable fan rate as a function of CPU temps, the fans just stay at a constant ~1300 RPM. In fact, even going to the bios and trying to hardware the fan speed to 20% or 50% etc. does nothing -- the fans always spin at the same rate. Any ideas on why? The manual suggests that it can control the fan speed even when using the 3-pin connectors.
 
Note: I bought the CPU cooler about 6 years ago and the fans have 3-pin connectors.
 
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    Cordorb
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    Re: z270 FTW K + Noctua NH-D14 = constant fan speed 2017/02/24 23:44:39 (permalink)
    I am using the CPU2 header- top of the board just to the left of the memory slots
    and set smart in the bios.  I think that header is pre-set to use PWM.
     
    some of the other headers in BIOS can be switched to PWM or voltage
    Voltage control  2 or 3 pins and PWM 4 pins
     
    BIOS give you 4 set points- may need to play with them for Voltage control
     
    --------------------
    http://www.tomshardware.com/answers/id-2559018/fan-speed-control-pin-pin-pin.html
    has a good reply from paperdoc with more info is you need it

     
     
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    Fewmets
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    Re: z270 FTW K + Noctua NH-D14 = constant fan speed 2017/02/26 05:13:25 (permalink)
    Yeah, CPU fans are PWM only. Since that cooler uses fans with DC voltage control you'll have to use one of the non-cpu fan headers if you want RPM control.
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