I bought two NUCs, but the fan was bad on the second one I got. The temperature would get high like what you describe and touching the case would literally burn my fingers. I checked the bios to discover it wasn't spinning.
I assume yours is spinning at least. How many RPMs? My third NUC worked, but the difference in RPMs is crazy between my two NUCs. One spins at about 1400 and the other at about 1800. Same settings on both. If you'd is spinning way too slowly that might explain it.
this is an older thread, but...
i updated to bios 36, which was released a few days ago.
in my case, the fan at idle runs at about 2800 rpm, instead of about 2000 rpm under bios 32 and earlier. the cpu temp at idle with bios 36 is 55C or so, instead of upper 60's before.
as far as i can tell, my fan is spinning fine.
at idle, the temp is in the mid-50's and the fan speed is 2400-2800.
when the cpu is busy, especially doing video conversions, the fan speeds up and sounds like a prop jet at the end of the runway!
just for fun, i will take the mobo out, remove the processor, and replace whatever heat sink compound is there with some arctic silver and see if that makes a difference.
having said that, i think this cpu is made so that running hotter than we're used to seeing is OK. as you've probably seen, the intel specs say max temp is over 100C.
If at all possible, please provide pictures of the heatsink teardown. I didn't go that far with mine as I did not think it was needed.
i just finished removing the mobo and replacing the factory thermal compound with Arctic Silver Ceramique 2 compound. it seems that the proc, at idle, is running in the upper 40's instead of the mid-50's, and the fan is running 100-200 rpm's slower.
took about 5 minutes to do.
i referred to the following site to make sure i properly removed the mobo from the case
i'm not suggesting there is a problem with cpu temps. I just wanted to see if a different thermal paste would make a discernable difference.
GIven that the spec for this CPU's max temp is over 100c, even the 70c temp I see when doing video conversion isn't a problem, as I see it.
Those are two good options.
Logic Supply has developed a NUC enclosure for the light industrial market called the AG960. Given our sector's focus on stability and longevity, we worked on the thermal issues and our solution employs a heat sink that makes a measurable difference. At a 50% duty cycle, our unit showed improved performance vs Intel's consumer NUC (both configured with an Intel SSD and a wireless card). Take a look at the test results here: System Comparison: Intel "Ice Canyon" NUC vs LGX AG960 NUC Logic Supply Blog
The BIOS version 0040 - included an adjustment to fan control settings, so if you do not have that one installed, please do so. It is available Download Center
Then you can try the latest one 0042 after that .