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There’s something I’d don’t understand about this. Apple’s RAM is on their own die. Is the price of RAM an indicator for the cost of die space in general?

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No - DRAM is made on a different process than compute. Apple uses dram made by the usual dram manufacturers.

The dram shortage is a combination of high demand + shifting manufacturing to HBM, which consumes more wafer capacity than DDR5

SoC RAM is on a separate die in the same package. With modern chiplet architectures even the CPU itself isn't on a single die.

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