Considering there are tens of options in the Brix lines the comment about them being fanless is untrue. Most are actively cooled machines. None of the Brix or NUC I have are particularly loud. If you're doing heavy lifting on a small form factor machine you have to expect a small fan to generate noise to dissipate heat, there's really no way around it.

I edited the comment to reflect the fact that the base model of the Gigabyte Brix -- which I have two of -- is fanless and passively cooled.