> The Fujitsu ones have D3417(-A!) boards (not -B) having proprietary power supplies with 16 power pins (no 24pin ATX but 16pin). There are Adapters on Aliexpress for 24PIN to 16pin (Bojiadafast), but this is a bit risky - I'm validating that atm.
They work just fine. The pinout is well known [1]. You can also adapt a normal ATX PSU if you boost 5VSB to 11V.
Fujitsu boards are great, and very inexpensive to purchase in the EU. Someone has even reverse engineered the license for the KVM features of their remote management (iRMC S4/S5) [2]
[1] https://web.archive.org/web/20200923042644/https://sector.bi...
[2] https://watchmysys.com/blog/2023/01/fujitsu-irmc-s4-license/