I just set up a PWM hub and I'm facing an issue where I can only control the CPU fan speed while the others remain unresponsive. I used a Cable Matters PWM hub and connected it directly to the CPU_FAN header. I've plugged in all four 4-pin cables, including the CPU fan and four case fans, into the hub. Even after adjusting my BIOS settings to set the CPU to PWM, neither Argus Monitor nor FanControl seems to detect the PWM hub. What might I be missing?
2 Answers
It sounds like you're experiencing typical PWM hub behavior. Unlike a USB hub, a PWM hub only shows as one fan to your motherboard's super I/O. Since you plugged it into the CPU_FAN header, your system recognizes just the CPU fan. This setup isn't ideal because your motherboard usually controls the CPU fan based on its temperature, separate from the case fans. I recommend disconnecting the hub from the CPU_FAN header. Connect your actual CPU fan directly to that header and then plug the case fans into the PWM hub. Finally, connect the hub to one of your SYS_FAN headers. If your case fans aren't all the same model, try to pair identical ones together on the hub and connect different models directly to the SYS_FAN headers to ensure they work correctly. Unique fans might behave unpredictably when controlled via the hub. Good luck!
Quick tip – it’s important to know the limitations of the motherboard headers. For instance, on the Gigabyte B550M-DS3H, some users report that only the CPU_FAN header works well with PWM settings. Just double-check your motherboard specs to be sure you're using the optimal setup. If both CPU and SYS_FAN aren't giving you full control, you might need to adjust your expectations on fan speed control. Stick with a direct connection for more accurate fan management!
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