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Kingston 8GB DDR4 2666MHZ SODIMM at Amazon.com
32GB DDR4-2666MHZ Non-ECC CL19 SODIMM 2RX8 at Amazon.com
v-Color 64GB (2 x 32GB) ECC SO-DIMM DDR4 2666MHz (PC4-21300) for microservers, workstations, Networking Platforms and Embedded Systems 2Rx8 CL19 1.2V (TES432G26D819K-VC) at Amazon.com
Amazon.com: Crucial RAM 16GB Kit (2x8GB) DDR4 2666 MHz CL19 Memory for Mac CT2K8G4S266M : Everything Else