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8GB RAM on M3 MacBook Pro 'Analogous to 16GB' on PCs, Claims Apple
(www.macrumors.com)
This is a most excellent place for technology news and articles.
Windows compresses RAM too. It's really a combination of fast flash memory (Apple doesn't use SSDs, they put flash memory on the same package as the CPU) and being smart about moving things to flash memory if they don't benefit from being in RAM.