Are read/write speeds even faster with the 4TB version?The 16" 2019 MBP and the 13" 2020 MBP have the same magic keyboard. As for Thermal throttling that was solved with the 15" model and there are plenty of articles to back that up with hard technical data. On that note all CPUs have a sustained and burst speed, once the CPU heats up it will drop from the burst speed to the around the core clock speed which can be sustained, Mac and PC are no different in this regard.
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If you buy the 2TB model the read/write speeds are 2700 MBs / 3200 MBs, far higher than anything in the review.
(I can't believe that they would be)