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The behavior you are describing is actually an expected behavior.
You can refer to the following thread for further information, even when it is related to a different Intel® NUC, it also applies to the one you have.
NUC6CAYH cooling fan regulation not working properly
You can also check the following articles regarding overheating:
Frequently Asked Questions about Temperature for Intel® Desktop and Mobile Processors
Computer Is Overheating Warning Signs
I hope this information helps.
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I'm not sure that thread describes the same problem. I have selected different cooling options in the bios but the it doesn't change the fan speed. It is always running at about 4000 rpm and none of the bios options (including fanless) have any effect. The fan also does not turn off, ever, including when the temperature is low.
Why would the bios have these options if they have no effect?
I also tried installing SpeedFan to see if I could control the fan speed there, but it shows no fans.
1 of 1 people found this helpful
Actually, the BN NUCs (NUC7i3BNK, NUC7i3BNH, NUC7i5BNK, NUC7i5BNH and NUC7i7BNH) all utilize Intel Core processors and the Intel Core processors *do* support the PECI bus and they *do* expose both Processor and PCH (chipset) temperature readings that can be used by the fan speed control subsystem.
I looked at the profiles that are offer in Visual BIOS and I didn't think much of them. They are so close in configuration that the results are similar regardless of which you pick. I decided to use a custom configuration:
Give this a try. Overall, I do not recommend lowering the Minimum Duty Cycle -- and I strongly recommend keeping it this high if you have a NUC7i7BNH. If you really must lower this value, however, note the following:
- I recommend that you set both Minimum Duty Cycle parameters to the same value. There's only one fan.
- You must also adjust (increase) the Duty Cycle Increment:
- The duty cycle should reach 100% at or before the Processor temperature reaches (my recommendation) 83c.
- The duty cycle should reach 100% at or before the Memory temperature reaches (my recommendation) 73c.
- Here is equation: Overall, I do not recommend lowering the Minimum Duty Cycle and I strongly recommend keeping it this high if you have a NUC7i7BNH. = (100 - Minimum Duty Cycle) / Duty Cycle Increment. The result must be an integer; so adjust up for decimals. For example, if result is 4.25, adjust up to 5.
Hope this helps,
Thanks. That was very helpful. I did lower the Minimum Duty Cycle to 30 and it is very quiet now. I ran Prime95 for a while and the fan speed did increase, so the system does seem to be working correctly. I'll experiment with different settings to see what gives me the right balance of noise vs cooling.