[aus_]

Just to clarify: P-series (Power/POWER8) Linux is not the same as what is announced here. LinuxONE runs on the System z (mainframe / s390x) platform.

[rodgerd]

Yes, but they now share the same microarchitecture. s390x is mostly a difference in the microcode.

[nickpsecurity]

It has a custom processor:

https://en.wikipedia.org/wiki/IBM_zEC12_%28microprocessor%29