Shenzhen Maxtang Computer Co., Ltd
15
3.3.2 CPU
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Power Management Control
Intel® Speedstep®(TM):
Enhanced Intel SpeedStep® Technology enables the operating system to control multiple frequencies and
voltage points for optimal performance and power efficiency.
Intel® Speed Shift Technology:
An energy
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efficient frequency control method by the hardware rather than relying on OS control.
Processor decision is based on the different system constraints for example Workload demand, and thermal
limits while taking into consideration the minimum and maximum levels and activity window of performance
requested by the operating system. Default enabled.
Turbo Mode
The Turbo mode refers to Nehalem’s “Integrated Power Gate” power management technology, which
allows running off some cores and adding power to the others so that they run at a higher frequency. The
capacity of the entire CPU remains unchanged, and the efficiency of the CPU is optimized. Default enabled.
C states
Idle States (C
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states) are used to save power when the processor is idle. C0 is the operational state,
meaning that the CPU is doing useful work 100% load. C1 is the first idle state, C2 the second, and so on,
where more power
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saving actions are taken for numerically higher C
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states. C1 to C3 cuts off the clock inside
the CPU, and C4 to C6 reduces the CPU voltage. Default enabled.
Enhanced C states
C1 to C3 cuts the clock inside the CPU. C4 and C6 mode reduces CPU voltage. Features two way
“Enhanced” mode, enable by default.