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Reference Material Supermicro X9/X10/X11 Fan Speed Control

Supermicro fan speed control

  1. weust

    weust Member

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    Also just checked my fan speed mode on the BCM page, it's set to full speed.
     
    #61
  2. AndrewX192

    AndrewX192 Member

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    In case anyone else struggles with fan control on similar X11 boards, the approach I'm taking now is to use a Nocuta NA-FC1 to reduce the PWM signal to reduce the amount of noise the chassis produces. I got a bunch of fan extension cables, and plan to cut the PWM wire from each fan extension at the motherboard (female) side of the connector and join these together at the PWM controller, and have FAN1's tachometer reading pass through the NA-FC1 so that it can handle the "low RPM" solution that Noctua provides. This has the advantage of not driving all the fans off the same motherboard header, and avoids the need to do some crazy Molex->Sata->NA-FC1->fan splitter to three (w/ two fans) -> fan splitter to three (w/ two fans) to power four fans.

    I'll try to post some pictures of the wiring harness once complete.
     
    #62
  3. chaoscontrol

    chaoscontrol Member

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    Have you tried rebooting (the BMC and server) after setting it to FULL?

    I have the same problem and this is my last hope but I can't try it until I'm back home.
     
    #63
  4. sparx

    sparx Active Member

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    Is it possible to set both zones to same fan curve? I have 5 of the same fans and a passive heatsink on cpu. FAN1-4 connected and FANA.
     
    #64
  5. weust

    weust Member

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    Yes. That is what I do. Check my script a few ports back.
     
    #65
  6. AndrewX192

    AndrewX192 Member

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    Yes, I've pretty much exhausted my options. I ended up installing an NA-FC1 between the FAN1 PWM pin and the PWM pin for all the fan connectors. I can't upload the picture for some reason, but essentially what I ended up doing was taking a 5 pack of 4 pin fan extension cables, and removing the PWM signal wire from each fan header, reconnecting all the extension cables between the FANx header and appropriate fan, and joining all the PWM controllers with the NA-FC1 inline on FAN1. This allows the NA-FC1 to see the fan speed of FAN1 and control all of the fans, without needing 4 NA-FC1s or pulling all the power from a single fan header. As an extra bonus, since the tachometer wire from each fan still goes back to it's appropriate header, the BMC still sees each fan's speed. The system runs near silently now, and even has better thermals than my 2U and 3U chassis...

    m1QF7Wz.jpg
     
    #66
  7. chaoscontrol

    chaoscontrol Member

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    Just to add to this. For me on a X10 board (X10SRW-F) it only worked after a reboot of the unit and the ipmi. Then the commands would stick. It will default back to FULL after a reboot or messing with the fan settings again. It's now set on 20% speed and scripted it to set it back to 20% after a reboot.
     
    #67
  8. weust

    weust Member

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    That is normal. That is exactly why people use a script on boot up to set the desired fan speed.
    Full speed from IPMI is also needed.
     
    #68
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