In an attempt to stop the extremely annoying fluctuating fan speeds (seemingly far too sensitive to small and unnoticeable changes in cpu temperature), the only option I have found to work (apart from "Fixed") is a custom setting as shown in the attached image.
Surely below 55 degrees with these settings the system fan should be off, but it is not. It seems to come on at about 50 degrees regardless. Is this a bug?
Also, why are there no settings for the CPU fan?
Decca, Thank you for posting in the Intel® Communities Support.
In order for us to provide the most accurate assistance on this matter, we just wanted to confirm a few details about your system:
What is the model of the Intel® NUC?
Is this a new Intel® NUC?
Did you make any recent hardware/software changes?
Was it working fine before?
When did the issue start?
Which Windows* version are you using?
Which is the BIOS version currently installed on the Intel® NUC?
Just to confirm, the problem that you are describing, is it about the fan noise or is it about the fan speeds ramping up and down?
Any questions, please let me know.
Intel Customer Support Technician
A Contingent Worker at Intel
The model is a brand new NUC 9 Extreme Kit - NUC9i9QNX.
Working fine - no changes. It is doing what it has always done since purchase.
Latest v54 firmware installed. No change noticed since firmware v52.
Using Windows 10 v1909.
Not a noise problem, just the fluctuating fan speeds, and the issue with the custom setting that I mentioned.
I am testing 2 equivalent systems and they both behave as you described but, to be honest, I can only perceive this fan fluctuation when there is absolutely no ambient/background noise. I was actually extremely surprised in a positive way by the quietness of the system.
Here are a couple of pictures of my BIOS Cooling report:
Please let us know if you are having any particular issue and we will be more than happy to help you out.
It's not massively loud, but I can hear it clearly.
It just seems to be extremely sensitive to a temperature fluctuation that is not visually evident in HWInfo. I would suggest that all it would need is for fan speed to be based on an "average" reading taken over the last few seconds.
Yes, I'm also hearing this "issue" with the NUC9i7QNB. (in the bios & windows, after a save and reboot)
On the existing profiles, the slight nudge over 50c (during minimum cpu use) causes the fan to frequently purr (as it's turned on and pushed through the noisier frequencies, and instantly turned off).
So far, 1. Turn off Turbo Boost
Question... wouldn't Minimum Duty Cycle % conflict with Fan Off Temp? Since the fan shouldn't go below that %? If that's not the case, why can't I set the Minimum Duty Cycle to something nice and inaudible like I can for the fixed setting (16%)?
There might actually be a bug in the bios Custom cooling settings? As both the Fan Off & Minimum Duty Cycle settings don't appear to be respected.
What I really want is for the fan to run at 16%, but to also ramp up as things get warm
(I currently have the NUC9i7QNB on the latest bios and in a Cooler Master case with no other Primary Temperature Censors but the CPU.)