Thank you for providing feedback, I will send this to the corresponding department.
I can confirm this issue for every of my four NUC D34010WYK:
An extremly high pitch whine while standby but also under heavy load and during write access to mSata SSD - sometimes louder than the fan running at 20%!
Very annoying, getting louder over the time making passive cooling in a passive enclosure totally senseless.
Thank you for letting us know, we really apologize for any inconvenience and we really appreciate your feedback, it is essential in the growth of our Customer Service.