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Apple uses LPDDR4 which comes in densities of up to 16Gb AFAICT. So they can have ~5X as much memory using the same bus width.

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Apple uses LPDDR5X, not LPDDR4, iirc

Of course it's ddr5 not 4.

From PCB perspective, LPDDR5(X) interface is quite different from regular DDR5. Same with DDR4 and LPDDR4. Source: have designed few boards with different memory interfaces.

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