For those who don't need quite that much power I recently added an Orange Pi 5 to my own homelab, the RK3588 SoC packs an impressive punch for what it is
And despite their broadly similar performance, the RK3588s have significantly better power draw.
However I’m not sure of any of the rk3588 vendors that support both UEFI and have a full-size PCIe slot like the MS-R1 has.
Does it run a mainline Linux kernel?