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life. In computers with utility power, the justification is to reduce the cost of power, cooling or noise.

Most modern computers use CMOS logic. CMOS wastes power in two common ways: By changing state, i.e. "active power", and by unintended leakage. The active power of a computer can be reduced by turning off control signals. Leakage current can be reduced by reducing the electrical pressure, the voltage, making the transistors with larger depletion regions or turning off the logic completely.

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