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Fixing 10-20 Terabytes of Memory, we can get
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16000 way parallel natural evolution of today's machines with various architectures from distributed shared memory to clustered heirarchy
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Peak Performance is 150 Teraflops with memory systems like today but worse with more levels of cache
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5000 way parallel Superconducting system with 1 Petaflop performance but terrible imbalance between CPU and memory speeds
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12 million way parallel PIM system with 12 petaflop performance and "distributed memory architecture" as off chip access with have serious penalities
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There are many hybrid and intermediate choices -- these are extreme examples of "pure" architectures
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