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>I reckon it is only feasible if the RAM crawls into the CPU. reply

And God said, "Let there be Cache." And there was Cache.

I think the proposal is to solder an entire stick of ram onto the CPU.

Or CPU onto the RAM stick...

https://www.nextplatform.com/2017/02/23/promises-challenges-...

From A Certain Point Of View™, this is what the RPi and SO-PINE compute modules are, except unfortunately they're no longer usable as memory modules per se.

So a level 4 cache?

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