Prime Computer has a very particular vision with the Primestation Pulsar. The concept of the powerful office PC is to be sustainable in all regards. We take a closer look, running it though our tests, and find that the fanless concept can be quite convincing.
https://www.notebookcheck.net/Primestation-Pulsar-desktop-PC-review-AMD-Ryzen-Pro-with-passive-cooling-and-sustainable-production.625688.0.html
Of course there is competition. For example, the German company cirrus7 makes nimbus which costs about €500 less in an equivalent configuration (assuming Windows Home licence is included). You can choose how big a body/ heatsink you want, trading size for cooling/ performance (ranging from 9 to 12 cm thick). They also have X300-based incus (you can buy the case separately if you already have an ASRock DeskMini).
Just to add, the incus is about €750 cheaper in the 65 W version (again, including Windows Home) but you lose some ports compared to a Mini-ITX nimbus. The case itself is €240, so, not exactly cheap and their component prices are not low either (using street pricing, you could probably lose another €300). Which makes Pulsar look very overpriced.
All Ryzen Pro variants are CPU Processor Clocked Locked so that's suitable for Fanless but not suitable for Consumer/Gaming.