C-states are used to minimize consumption when a processor can be idle P-states prevent the processor from consuming too much when work is being done. ![]() Intel® processors, and the Intel® Xeon Phi™ coprocessor, have many advanced power management features that notably include idle states (C-states) and performance states (P-states). Evan Felix, in High Performance Parallelism Pearls, 2015 Processor features: Modern power management features
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