I'm facing a frustrating issue with my CPU cooler fans—they're locked at around 2000 RPM even when my system is idling. I've tried changing settings in the BIOS (specifically on a Gigabyte B650 motherboard using Smart Fan 6), but nothing seems to work. Here's the rundown:
- The CPU cooler fans are part of an AIO radiator and are connected to the CPU_FAN header, where they show up in BIOS.
- My case fans are hooked up to a hub (iTek Dark Cave DS) instead of being connected to the SYS_FAN headers directly.
- Strangely, the SYS_FAN headers show 0 RPM reading in BIOS.
- During idle, my CPU temperature stays between 40-45°C (Ryzen 7 7800X3D).
- I've switched to PWM mode, selected a Silent profile, and set a manual fan curve (very low percentages), but the CPU fan speed remains stuck around 2000 RPM.
I've even tried stopping the case fans to confirm the noise is from the radiator fans, and changing the BIOS fan curves doesn't seem to affect the RPM at all. I'm wondering if this could be due to the AIO fans being controlled by a hub rather than the motherboard PWM, incorrect wiring, or if there's some limitation with the AIO unit itself. Any insights would be greatly appreciated!
2 Answers
What AIO cooler are you using? Sometimes certain models have their own control schemes that can conflict with motherboard settings. It might be worth checking if your AIO has its own software you can install for better fan management.
It sounds like the hub could be the problem here. If your case fans aren’t connected to the motherboard, that might be causing some interference with how the CPU_FAN header operates. You could try connecting the AIO directly to the motherboard instead and see if that makes a difference.
Yeah, that sounds plausible. I’ll give that a shot and see if it resolves the issue.
I’m using the Thermalright CORE VISION 360. It’s pretty solid, but maybe it has quirks with fan control.