The limit is strictly to cost of memory at this time. If you wanna get by that limit, you have to, well… design it yourself in house.
Do you really think that Micron, Samsung and SK hynix are working in a cartel to prevent DDR5 memory from being manufactured?
Spoiler alert: they're supply-constrained too. Their customers will pay to outbid Apple, just like how Apple outbid the industry on TSMC's 5nm node.
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