Mellanox InfiniBand SX6018 - Switch - EMC only - $300 OBO

Discussion in 'Great Deals' started by Rand__, Jan 11, 2017.

  1. necr

    necr New Member

    Joined:
    Dec 27, 2017
    Messages:
    7
    Likes Received:
    7
    Got 4xNoctua NF-A4x20 and replaced 4 super noisy stock fans out of HELL.
    Default pinout is as follows (you 're looking at terminals, with two smaller hooks facing down, holes facing away):
    1.Red +12v
    2.Blue Tachometer(RPM)
    3.Yellow PWM
    4.Black GND

    I've unmounted stock fan block, removed wires from white connectors, removed black connectors from Noctua fans, connected wires as above. Below is Noctua color wiring, same layout
    1.Yellow +12v
    2.Green RPM
    3.Blue PWM
    4.Black GND

    After connecting all of them to board PWM takes effect (without active alarms fans go from ~20% to ~40% in cycles, which makes it unbearable). Even with Noctua low-noise adapter (which kinda makes cycles smoother) it was more irritating that running with 100% speed.
    So, I removed PWM wire from each connector. System detects all fans, but can't control them, and it's really quiet!
    So, my advice would be to get 3-pin fans and wire them the same way so you would know if one of them really fails.
    It's probably not possible to control fans from PPC board, tc daemon just reads data there.

    If that helped, please endorse: https://goo.gl/RfjbnG
     
    #21
  2. Freebsd1976

    Freebsd1976 Member

    Joined:
    Feb 23, 2018
    Messages:
    41
    Likes Received:
    4
  3. herby

    herby Active Member

    Joined:
    Aug 18, 2013
    Messages:
    147
    Likes Received:
    30
    #23
  4. Freebsd1976

    Freebsd1976 Member

    Joined:
    Feb 23, 2018
    Messages:
    41
    Likes Received:
    4
    did you found the slowset fan RPMs
     
    #24

Share This Page