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How to Upgrade iMac RAM: 2012-2022: EveryMac.com
Install memory in an iMac - Apple Support
32.0GB OWC Memory Upgrade Kit For 2010-2011 Apple iMac
CMS 32GB (4X8GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple®½ iMac 21.5" Intel Core I7 2.8Ghz (A1311) - C12 at Amazon.com