A dual-voltage CPU uses a split-rail design so the processor core can use a lower voltage, while the external Input/Output (I/O) voltages remain at 3.3 volts for backwards compatibility. A single-voltage CPU uses a single power voltage throughout the chip, supplying both I/O power and internal power. As of 2002 Microprocessor#Market statistics, most CPUs are single-voltage CPUs. All[citation needed]CPUs before the Pentium MMX are single-voltage CPUs. Dual-voltage CPUs were introduced for performance gain when […]
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