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IBM claims 7x better per-core performance vs x86, but they're lying about that, of course.

Overall, yes, I have difficulty believing that number. For a subset of common workloads, it might actually be true, though.

IBM does some crazy stuff with hardware acceleration and specialized units that take load off of the actual CPUs.

I tried out hardware accelerated compression on a z15 and it just speeds it up a stupid amount, something like 20x times in decompression and 200 times with compression [0], which is not something that is done many other places yet. Though the PlayStation 5 does have it [1]

[0]: https://github.com/rust-lang/libz-sys/pull/72#issuecomment-9...

[1]: http://cbloomrants.blogspot.com/2020/09/how-oodle-kraken-and...

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