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macOS 27 requires Apple Silicon, as Apple draws down the Intel Mac era
(arstechnica.com)
This is a most excellent place for technology news and articles.
they just used their own arm chips, but didn't require them for macos until now. that meant up until now you could still use older intel macs with the newest macos version, but won't be able to do that anymore starting with 27. only apple chips will get the newest version.