Daniel Denson got a reaction from
TRS-80 in PC Engines APU boards as distributed storage nodes
I'm biased, I actually run a PC Engines distributor... (embeddor)
All APU2/3/4 run the same quad 1Ghz AMD Jaguar CPU. They have zero 'IME' or similar options and run coreboot open source bios.
These units can support SATA controllers on the mPCIe which means you can potentially put 13 SATA drives on or more if you get fancy.
These units absolutely smash an esspressobin. They are not in the same league. I've build a couple of hobby CEPH clusters on 2C4 units.
They have good intel nics (seems a strange mix of an AMD SoC and Intel nic but I'm not complaining)