People recommend "32GB 4x8GB DDR4-2933 PC4-23400 RDIMM Memory for Apple Mac Pro 2019 MacPro 7, 1 by Nemix Ram"
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32GB 4x8GB DDR4-2933 PC4-23400 RDIMM Memory for Apple Mac Pro 2019 MacPro 7, 1 by Nemix Ram

Updated: 7 Sep 2020
Nemix Ram 32GB Kit (4x8GB) DDR4 2933 PC4-23400 / 1.2V 288-Pin SDRAM Compatible with Apple Mac Pro 2019 MacPro 7,1 (28-Core / 24-Core / 16-Core / 12-Core) Model ID: MacPro 7,1 2.5GHz 28-Core / 2.7GHz 24-Core / 3.2GHz 16-Core / 3.3GHz 12-Core Meets and Exceeds Apple Specifications