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If there are any, you can be sure that they're not using z/OS. More likely would be one of those rack-mounted models that only run z/Linux (and possibly z/VM).

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Z/OS systems are rackmount nowadays too, they just take up the full 42U.

At least back in the POWER8 days those z/Linux systems were the fastest you could buy, and IBM was super happy to let you overclock them: their reps told me that was just more CPU sales for them.

Why would they do that instead of standard PC hardware?

IBM has many decades of innovations (and patents) on making their mainframe hardware super resilient.

My previous company had a large estate of linux and mainframe applications. While ensuring that the disaster recovery is implemented in linux applications was a nightmare with different standards and different ways of doing things, in mainframe it was inbuilt.

While the mainframe may be old and out of fashion, it did have the capabilities that we are rediscovering in Cloud, containers, VMs and all...

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