"Orders of magnitude" is implausible, and certainly not supported by published STREAM results for POWER8, even excluding HBM in Knights Landing, for instance.

"Orders of magnitude" is implausible, and certainly not supported by published STREAM results for POWER8, even excluding HBM in Knights Landing, for instance. I'd love to see some actual performance figures for POWER9, though, or even facts about its SIMD, in particular.