The well known noise and overheating issue of Nuc8i7beh has bothered many NUC users. My nuc has been working well but recently the noise became intolerable. Here is the brand new nuc I received in Dec 2019:

Disassembled parts:

I decided to refurnish it with the following approaches.

1. Replaced with new copper tube and mental liquid to improve CPU cooling capacity.
2. Lubricated the CPU fan.
3. Optimized BIOS settings.

After refurnished:

Now it is quiet as usual and the overall performance is even better than the new nuc!