At some point the physical distance to parts of cache would mean you'd have rapidly diminishing returns on adding more. For 16GB it'd need to be some kind of ti

At some point the physical distance to parts of cache would mean you'd have rapidly diminishing returns on adding more. For 16GB it'd need to be some kind of tiered thing with nearer cache segments being quicker. Maybe you could have it present itself as a giant unified cache... sort of like what they did in the new IBM mainframes.