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Thanks. Also it appears SAM can work on Zen2!
https://twitter.com/IanCutress/status/1337423558042120194?s=20
Dr Ian Cutress said:Got a response from AMD about PDEP and SAM:
'Smart Access Memory does not depend on the performance of the PDEP instruction.'
The speculation about accelerated PDEP on Zen3 being a factor seems to not be the case.