I've buyed the Intel NUC Kit NUC8i7BEK including the i7-8559U this week and have already some trouble with the fan noise even if there is low systemload. So I read some tests and forum posts and tried the recommended settings cooling and CPU-Turbo setting. This has brought some improvement but I am not really satisfied yet.
With the somewhat higher model the NUC8i7BEH I have read so far in many tests that this should be quite quiet.
Now my question is whether someone has this NUC8i7BEH in use and also has problems with the fan noise or this is less prone to fan noise by the not so flat design? And if someone who had issues with his fan noise replaced his nuc that solved the problem.
The board (with attached heatsink-blower unit) used in the NUC8i7BEK is the exact same one used in the NUC8i7BEH. The noise generated by the blower should be the same regardless of which chassis type is present - but you need to understand that noise is directly related to the amount of heat in the system. In the case of the NUC8i7BEH, there is a larger volume of air within the chassis and this can have a (small) damping affect on the temperature. Once you have a HDD/SSD/SSHD installed into the drive bay, the volume of air in the chassis will be smaller - a lot closer to that of the NUC8i7BEK - and this drive is going to generate some additional heat. In my experience, this isn't enough to make the NUC8i7BEH run hotter (and thus louder) than the NUC8i7BEK, however.
If you are having what may seem like an inordinate amount of blower noise, this could be the result of a poorly-mounted heatsink, too little or too much TIM (paste), failing TIM (dry, for example) or a blower that has its blades rubbing, its bearing loose or rubbing, etc. If it seems inordinately loud, make a recording with a smartphone and post it here. We can then help you determine whether there is something wrong and you need to have Intel replace the unit.
Thank you very much @n.scott.pearson ! that makes perfect sense to me. I think that I am better advised in perspective with the Intel NUC Kit NUC8i7BEH and this could better fit my requirements regarding fan noise, also if the impact might be small. so nice that there are kind people like you in forums! have a nice day!