What IC does AsRock usually use to make the PWM signals for GPU fans ?

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  • MasterCap
    Member
    • Jul 2022
    • 37
    • Canada
    #1

    What IC does AsRock usually use to make the PWM signals for GPU fans ?

    I have an AsRock Taichi 7900xtx, and the minimum fan speed is way too high at 1000rpm, and thats with it's Quiet BIOS switch on, and me setting the fan profile as low as it goes, while on.

    Now 1 thing I could do is just make some circuit to put in between the fan the the GPU, and leave the fan on all the time, but anytime the GPU is sending the PWM for min speed, I'll just send something lower and quieter.

    But does anyone know what how AsRock usually sends the PWM to the fans on GPUs and mobo's? Is it from the MCU that's often near the 12V inputs and fan jack ? Or is it some nearby PWM IC, and some MCU sends it serial commands or control voltages?

    There's some huge PCB pic's here
    https://www.techpowerup.com/review/a...-taichi/3.html
    Tags: None
    • прямо
      Badcaps Veteran
      • Sep 2022
      • 261
      • Indonesia
      #2
      PWM signal for the fans is generated by the GPU core based on its internal thermal sensors.

      The fans speed curve however, is defined in the GPU BIOS firmware. With 1000 RPM being the minimum in this case.

      If that's too noisy then the problem is with the fans, because at that speed, they should have been pretty quiet.

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