A refurbished Fujitsu FUTRO S740 thin client, it has one SATA m.2 slot, and I replaced the Wi-Fi m.2 with an adapter for an extra NVMe. They are pretty big in Germany as small homeservers, because there are a lot of used ones around (I paid 44€ for the 8 GB version). There’s an overview [0] page for them, and a list of power measurements [1], both in German, though.
[0]: https://github.com/R3NE07/Futro-S740/blob/main/README.md
[1]: https://github.com/R3NE07/Futro-S740/blob/main/power_consump...