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RAM is easy. The hard part is making the unified memory SOC like Apple's. From what I know, Apple performance is almost magic. And whatever Apple is making, they are at peak capacity already and they can't make more even if they want to. Nobody else has a comparable technology. Apple is in its own league.

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Apple is just using a wide memory bus, the same as GPUs and server-class x86 CPUs do. It's not even hard, it's just not something desktop CPUs previously had any use for so the current sockets don't support it.

And you could do the same thing without even changing the socket by including RAM on the CPU package as an L4 cache. Some of the Intel server CPUs are already doing this.

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