Not sure which part of my comment you were referring to but if it was about the 1TB/s of mem bw it seems it is rather 409GB/s per-socket.

From https://www.ibm.com/support/pages/ibm-aix-power10-performanc...

> The Power10 processor technology introduces the new OMI DIMMs to access main memory. This allows for increased memory bandwidth of 409 GB/s per socket. The 16 available high-speed OMI links are driven by 8 on-chip memory controller units (MCUs), providing a total aggregated bandwidth of up to 409 GBps per SCM. Compared to the Power9 processor-based technology capability, this represents a 78% increase in memory bandwidth.

And that is again a theoretical limit which usually isn't that interesting but rather it's the practical limit the CPU is able to hit.