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Continue to ChatiMac Pro's RAM can be upgraded, but only by Apple or authorized service provider https://macdailynews.com/2017/12/14/imac-pros-ram-can-be-upgraded-but-only-by-apple-or-authorized-service-provider/
iMac Pro's RAM can be upgraded, but only by Apple or authorized service provider https://macdailynews.com/2017/12/14/imac-pros-ram-can-be-upgraded-but-only-by-apple-or-authorized-service-provider/