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Crucial 8GB DDR4-2666 PC4-21300 CL19 Single Channel Memory Module CT8G4SFRA266 - Micro Center
Amazon.com: OWC 8GB (2 x 4GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S08P) : Everything Else