I have a new build with ASUS B650M-PLUS inside a Lian Li A3 with a CPU fan and one case fan plugged into CHA1. I set the fan speed inside the BIOS and it seemed to work at idle, but many times both fans will go to significantly higher percentages than they should be at based on the temperature. It appears that it is running off CPU usage and not CPU temp. This is somewhat fine because it is keeping the CPU temp lower than the fan curve, but I'd like to know what is controlling the fans. I'm running Windows 10 with no extra fan controller software.
These are my fan settings in BIOS and then hardware monitor log (Fan #1 is cha1 and Fan #2 is CPU) #. You can see CPU temp was 34F and CPU Fan was 55% and CHA1 was 49%. According to the curve the expected fan speed is about 30% and 12%, significantly different. What is causing the fans to not follow the curve set in the BIOS
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adding a little more data to this thread. Below is a data log of both fan speed percents and cpu temp. You can see the cpu temp stay the same and both fans spool up considerably when I opened up Steam and iRacing at the same time. based on the fan curves in the bios I expect since the CPU did not increase in temp that the fans would also have not increased in speed.
ahhh okay thanks! I got HWInfo and I'm seeing the cpu temps spike up under load and the fans are speeding up to match. Makes a lot more sense now. Thanks!
No problem 🙂 . In HWINFO you can also set polling interval, I use 500ms as default 2000ms is a bit slow for my liking.
