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OWC Memory Upgrades for 2017 iMac 27-Inch

Upgrade the memory of your 27-inch 2017 iMac up to 64GB. OWC memory kits are 100% Apple compatible and backed by a lifetime OWC warranty.

64GB of RAM in the new iMac costs $600 currently

Source: Memory Upgrades for 2017 iMac 27-Inch