Actually memory bandwidth is an essential problem in any computer as doing more computations per second requires accessing more memory cells per second!
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Harder for sequential than parallel computers
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Key limit is that memory gets slower as it gets larger and one tries to keep information as near to CPU as possible (in necessarily small size storage)
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This Data locality is unifying concept of caches (sequential) and parallel computer multiple memory accesses
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Problem seen in extreme case for Superconducting CPU's which can be 100X current CPU's but seem to need to use conventional memory
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