@nay POWER9 is either 4-way or 8-way SMT (with the former intended for PowerNV and the latter for PowerVM): https://en.wikipedia.org/wiki/POWER9#Core. There was some discussion of this in #hellomouse on the 3rd of March if you want to read backlog.
(Also, not really relevant to it being SMT4, but it has a pre-production DD2.1 revision CPU which has broken hardware virtualization and broken hardware gzip, so they can’t give anyone VMs on it.)
@nay found a 98-core epyc server for $4,500 on gumtree but i couldnt quite afford it 😢