OWC 16GB (8GB x 2pcs) 2666MHz
OWC 32GB (8GB x 4pcs) 2666MHz
OWC 32GB(16GB x 2pcs) 2666MHz
OWC 64GB(16GB x 4pcs) 2666MHz
OWC 64GB(32GB x 2pcs) 2666MHz
OWC 128GB(32GB x 4pcs) 2666MHz
OWC PC4-21300 DDR4 2666MHz memory for 2019 iMac 21.5" and 27".
NOTE: For iMac 21.5" the maximum ram supported is 32GB(16GB x 2pcs)2666MHz. 64GB(32GB x 2pcs)2666Mhz are not supported.
Warranty: Memory comes with Lifetime warranty.