Question about ASRock CPU Fan control

[minedwiz]

I have an ASRock 970 Extreme3 motherboard, using a Cooler Master Hyper 212 EVO cooler, obviously hooked up to a four pin fan header. I've attempted to get a fan control scheme going, both in the BIOS and the ASRock Extreme Tuner desktop utility. I keep the fan speed at a certain preset, but target the "CPU Temperature" of 45 celsius as my target temperature. As I understand it, once I surpass this temperature, the fan should spin up to bring it back down to or under 45.

However, this does not appear to happen. Once the temp hits 46-47, I can hear no audible spin up, and I can't see a big difference in fan tachometer speed. Is the difference too small to perceive in such a way, or is this functionality simply broken?

 

[Vectronic]

It might be too small of a difference.

@ 45C is when the fan *starts* to get faster, but it won't max out the fan speed/voltage if it's only a couple degrees above the target. It's not "intelligent" in that way, it's simply the beginning of the ramp/curve.

If the target is 45, and full fan speed is at 105... then you have 60 degrees/steps between idle speed/voltage and max... so 47 degrees, is probably only 2% over idle speed... if that's not enough to bring it back down/below 45... it doesn't care/know better.

I've noticed it on my Z77 Ext4... if you set the target to 60C, then if it gets to 65C the fans are spinning much faster than if the target is 45, and the current temp is 50C... because the ramp/curve is much steeper the higher the target temp is (say 3% faster each degree C than 1.5%, etc)

I don't know what it considers the limit/max temperature, but if you go with 105... then a target of 0 would be slightly less than a percentage per degree, a target of 52 would be like 2% per degree...etc

 

[minedwiz]

All right, thanks for the quick clarification. Good to know that I can safely run quiet fan speeds without worrying about it not compensating on hot days.