What is "voltage scaling" (e.g., dynamic voltage and frequency scaling, DVFS) used for in digital chip design, and what relationship does it exploit?
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Incorrect.
The correct answer is A) DVFS dynamically adjusts a chip's voltage and clock frequency based on workload, exploiting that dynamic power scales roughly with voltage squared and linearly with frequency, allowing significant savings during lower performance demand
Correct Answer
DVFS dynamically adjusts a chip's voltage and clock frequency based on workload, exploiting that dynamic power scales roughly with voltage squared and linearly with frequency, allowing significant savings during lower performance demand
Because dynamic power is approximately proportional to V^2 × f, reducing both voltage and frequency during low-demand periods can yield substantial power savings (since power drops roughly with the cube of the scaling factor if both are reduced together), which is why DVFS is widely used in mobile and embedded processors.