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A design must halve its dynamic power while keeping the same computation done per second. The measure most likely to achieve it is

  • A.reducing the supply voltage and widening the datapath to compensate
  • B.raising the clock frequency and idling for longer between bursts
  • C.moving the computation from hardware into an interpreted language
  • D.increasing the size of the instruction cache

Answer: A

Since power goes as the square of the supply and only linearly with frequency, doing the same work more slowly at a lower voltage wins. Widening the datapath restores the throughput lost to the lower clock, which is the standard parallelism-for-voltage trade.

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