CPUs and architecture

Which technique reduces CPU power consumption by dynamically changing operating frequency and supply voltage according to the load?

  1. ADVFS (dynamic voltage and frequency scaling)
  2. BOverclocking
  3. CSIMD
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Answer: A. DVFS (dynamic voltage and frequency scaling)

DVFS lowers frequency and supply voltage when the load is light and raises them when it is heavy. Dynamic power is proportional to the square of the voltage and to frequency, so lowering both together greatly reduces power. It is widely used in smartphones and laptops.

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More CPUs and architecture questions

  1. Which is an example of vulnerabilities revealing attacks that exploit traces of speculative execution left in the cache to infer data that should not be accessible?
  2. Which metric indicates the amount of heat generated under a standard heavy load, used as a guide for CPU cooling design?
  3. Which metric indicates the number of instructions executed per clock?
  4. What is the problem called in which power and heat constraints prevent all circuits on a chip from running at full performance at the same time?
  5. What does CPU stand for?