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Reducing the supply from 3.0 V to 1.8 V while halving the clock changes the energy per execution to about

  • A.the same value
  • B.36 per cent of its former value
  • C.60 per cent of its former value
  • D.18 per cent of its former value

Answer: B

Energy per operation goes as the square of the voltage, and 1.8 over 3.0 squared is 0.36; the frequency change leaves the energy alone. This is the whole argument for voltage scaling and why it is preferred to frequency scaling on its own.

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