Forget x86; OpenPower is it! Talos II Secure Workstation!
www.youtube.com
+ CPU Benchmarks POWER9 Blackbird - https://openbenchmarking.org/result/1907210-SP-1906238HV32+ Unreal® Engine 4 on OpenPOWER™ - https://www.raptorengineerin...

https://www.raptorcs.com/TALOSII

I just saw this, even if it is pretty old.

They continue the IMB powerPC architecture.

Talk with a developer

3mdeb develops coreboot for the architecture.

Here is an interesting presentation

OS Installation is complex, but Linux/BSD with support for ppc64 should work.

The used AMD Radeon Pro WX7100 GPU is pretty open, but the boot code contains blobs.

Just as the NVME controller.

This is a competitor to RISC-V, while the latter is in early steps but is high in trend and developing fast.

FYI, SimpleX chat on RISC-V