We rejoiced when Apple’s Mac Mini 2018 brought back the ability to upgrade memory, which had been soldered in its 2014 predecessor. Now iFixit’s teardown shows that the storage is soldered to the logic board instead.
If it had to be one or the other, it does make more sense to solder the storage. Since Apple doesn’t use M2 NVMe, an external SSD via the Thunderbolt 3 port can be faster, even without a drive that maxes out at 20Gb per second.
Another notable takeaway from the teardown: The service-center-upgradeable memory is encased in a cage. That explains how Apple was able to use faster 2,666MHz RAM in the small space without increased interference — mini PCs usually incorporate slower memory. And the power supply increases from 85 watts to 150w in order to support the higher-power processor and port options.
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More Info: cnet.com