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Amazon.com: A-Tech 128GB Kit (4x32GB) RAM for Apple iMac 2019 & 2020 27 inch Retina 5K | DDR4 2666 MHz SODIMM PC4-21300 / PC4-21333 260-Pin SO-DIMM Max Memory Upgrade : Electronics
Actualización de RAM y Disco duro SATA de Mac Intel 21.5" Retina 4K Display (2017) - Guía de reparación iFixit
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