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Intelligent RAMA microprocessor into a memory chipDave Patterson, Berkeley, 1997
Context  Distinct manufacturing lines  Processor-Memory performance gap  Memory wall  Awkwardness of DRAM chips          T...
Advantages  Higher bandwidth and lower latency     Less distance (no bus) and less complexity  Less energy consumption  ...
Disadvantages   Consequences on cost/bit and refresh  rate   Manufacturing challenges   Reduce interchangeability   ILP tr...
VIRAM2       2        22        222       2
Microarchitecture
Results Multiple operations can execute  concurrently across parallel lanes     High performancebut Not efficient with sho...
Conclusion   VIRAM / DIVA not real successes   but implications in embedded systems   Intel : Through Silicon Vias, person...
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8665814

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8665814

  1. 1. Intelligent RAMA microprocessor into a memory chipDave Patterson, Berkeley, 1997
  2. 2. Context Distinct manufacturing lines Processor-Memory performance gap Memory wall Awkwardness of DRAM chips Time to unify logic and memory
  3. 3. Advantages Higher bandwidth and lower latency  Less distance (no bus) and less complexity Less energy consumption  Less heat, better performance Costs efficient Save board space
  4. 4. Disadvantages Consequences on cost/bit and refresh rate Manufacturing challenges Reduce interchangeability ILP trade-off
  5. 5. VIRAM2 2 22 222 2
  6. 6. Microarchitecture
  7. 7. Results Multiple operations can execute concurrently across parallel lanes High performancebut Not efficient with short vectors Useless for non-vectorizable parallelism
  8. 8. Conclusion VIRAM / DIVA not real successes but implications in embedded systems Intel : Through Silicon Vias, personal technology to connect DRAM and processor First step to IRAM ?

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