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Apple has a memory problem and we're all paying for it
(www.macworld.com)
This is a most excellent place for technology news and articles.
There are specific performance benefits to soldering your memory to the board or making them part of the main die itself. It’s why GPUs have been doing it for a long time, and why laptops with soldered ram can often achieve higher clocks and lower latency than their socketed counterparts. It’s a tradeoff, but a calculated one. I’m sure Apple also adds the extra revenue from absurd upgrade costs into their calculations.