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  1. #1
    New ROGer Array
    Join Date
    Nov 2017

    Problems with fan hub from Be Quiet Dark Base Pro 900 - Bios can't read fans RPM


    My configuration:
    CASE - Be Quiet Dark Base Pro 900
    MotherBoard - Asus Maximus X Hero

    In that case there are 3 fans 140m connected to fan hub with 4pins connector.
    Fan hub is connected to motherboard 4pin CH_FAN3 (i have tested with CH_FAN1 and 2)
    Slider on the case is at max left position.

    Motherboard can't read RPM form fan hub, fans are rotating at full speed.
    So i can't adjust fans by motherboard.

    Anyone have similar problem with this case ?

    I was trying to connect fan to the first fan port - still not working.

    In manual there is a information:
    The fan controller has two modes of operation.
    1. Automatic operation
    For this the PWM signal of the MB is used and the speed of all fans connected (PWM and 3-pin) can be adjusted automatically through the MB. In this mode the fan controller slider switch must be set to the first position “0” on the far left.
    2. Manual control
    When the fan controller slider switch is moved from its first position “0” to the right, the PWM signal is dropped and the fan speed can be regulated manually If the slider switch is subsequently reset to its first position “0”, the PWM signal regains automatic control of the fans.

    Automatic PWM control of the fans requires cable “A” of the PCB panel (4.3) is connected to a PWM connector on your MB. Lacking such a connection the speed of the fans connected can only be regulated manually.

  2. #2
    iron man Array kkn's Avatar
    Join Date
    Aug 2011

    it can be the hub, try and connect one of the fans straight on to the mobo and see if you get up enny readings then.

  3. #3
    New ROGer Array
    Join Date
    Nov 2017


    If i connect any fan directly to the mainboard - it works prefect and i can read RPM from it.

  4. #4
    ROG Enthusiast Array el terrible PC Specs
    el terrible PC Specs
    MotherboardASUS Maximus X Hero
    Memory (part number)G.Skill Trident Z 3200mhz cl14 RGB
    Graphics Card #1ASUS GTX 1080 Ti Poseidon
    MonitorBenQ XL2546 1080p 240hz
    Storage #1Samsung 960 EVO 1TB
    CPU CoolerEKWB Supremacy EVO
    CaseFractal Design R6 Gunmetal TG
    Power SupplyCorsair HX850 Platinum
    Keyboard ASUS ROG Claymore
    Mouse Steelseries Sensei 310
    Headset Steelseries Arctis Pro GameDAC
    Mouse Pad Steelseries QcK Heavy
    OS Windows 10 Home

    Join Date
    Jul 2011

    Actually nevermind my original answer, I also seem to have the same problem, I was mixing them up..

    Can't read the speed of the fans at all, but it does actually look like they can be controlled in the bios when I switch cha_fan3 to PWM and test, just cant read the RPM, but the Be Quiet Silent Wings 3 are only max 1000rpm anyways, so they should just run at max all the time, can't hear them anyways
    Last edited by el terrible; 11-15-2017 at 10:10 AM.

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