Im using the ECS H81H3-M4 motherboard in my M1 and would really appreciate if someone could be so kind to explain whats involved in getting the CPU_FAN to alter RPM according to temperature? (if its possible?)
My CPU cooler is a NH-9UB SE2 and so far ive been using the included resistors to lower the RPM but I guess its better to have a temp controlled fan so that it would alter the rpm instead of the constant speed that perhaps is a bit loud on idle and not enough on load?
Ive never done this before, usually I just hook up a old Zalman Fanmate but it would be nice to have the RPM-control automated, is it possible with my setup?
It is absolutely possible with your setup.
First, your motherboard has two fan headers:
CPU_FAN is a 4-Pin PWM Controllable header
SYS_FAN is a standard 3-Pin Voltage Controllable header
In order to control them you will need to run some software. SpeedFan is one of the long-time favorites because it is free and has a ton of control. The downside is that it has a ton of options and takes some reading to set up properly.
Often motherboard suppliers include software to do basic overclocking, diagnosis, and fan control. If your motherboard didn't come with that software it is possible that you can use a different vendor's, you just might not get all of the functionality.
I would suggest the following for you:
1. A 3-Pin Y-Adapter to attach both fans to the same header
2. Attach the fans both to SYS_FAN Header
3. Download SpeedFan and read through the FAQ and Instructions.
4. Configure a Fan Control using one of the CPU Core Temperatures and controlling the SYS_FAN header (the SpeedFan Manual will help)
Keep in mind that there will be a minimum voltage required to turn the fans. It might be that even with SpeedFan set to 15% the fan still won't spin. So play around with it and find the right level to start, and then tweak the curve to get the temperature and noise levels you want.
[Edit] I forgot to mention that if you connect your Non-PWM fans to the PWM CPU header they will run at 100% all the time, no matter what you setup in SpeedFan. You can use the "LowNoise" or "UltraLowNoise" to step down the speed, but they will still run at a constant speed. Picking the SYS_FAN header on your motherboard will let you control the voltage of that output using SpeedFan.
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