That's nice, and you can get a 1,000,000 tps on the shelf POWER8 server if you wish (on simple select-only requests, after tuning and patching the PostgreSQL core by a couple of the best PostgreSQL hackers in the world - yes, using carefully crafted assembler, no less https://akorotkov.github.io/blog/2016/05/09/scalability-towa...).

That wouldn't make that server competitor neither for IBM Parallel Sysplex, nor even for Oracle Exadata.