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v-Color 32GB (2 x 16GB) ECC SO-DIMM DDR4 2666MHz (PC4-21300) for NAS Micro Server/Workstation/Compatible with Synology 21 Series 2Rx8 CL19 1.2V (TES416G26D819K-VKC) at Amazon.com
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32GB DDR4-2666MHZ Non-ECC CL19 SODIMM 2RX8 at Amazon.com
Arch Memory AM-D4ECSO-2666-16G 16GB 260-Pin DDR4 2666 MHz 2R ECC So-dimm RAM for Synology NAS Systems at Amazon.com
Amazon.com: Crucial RAM 32GB DDR4 2666 MHz CL19 Memory for Mac CT32G4S266M : Everything Else