Memphis Releases 32GB DDR4 UDIMMs & SO-DIMMs with or without ECC, Optional VLP and Industrial Temperature - Embedded Computing Design
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OWC 8GB PC21300 DDR4 2666MHz SO-DIMM Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S08G) at Amazon.com
File:Ddr3-vs-ddr4-cl-02.jpg - Wikimedia Commons
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OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com