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Introducing architecture variants: amd64v3 now available in Ubuntu 25.10
(discourse.ubuntu.com)
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Phoronix did some benchmarks contrasting stock amd64 vs. amd64v3. Not really impressive right now, but who knows if things will improve later on
Do you know if a similar report exists for Intel based CPUs?
I don't know, but if any exists you might as well find it in phoronix itself