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Install memory in an iMac - Apple Support
Apple iMac 21.5" Core i5-4570R 2.70 GHz, 8GB RAM, 1TB HDD, 10.15.6 Lat – Pcretroshop
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Install memory in an iMac - Apple Support
2012 2013 2014 Apple Imac 5k 27 Inch Memory Ram 4gb 8gb 16gb 32gb Ddr3 1600 - Rams - AliExpress