Intel BX80569QX6850 Datasheet download pdf (Page 99)

Datasheet 99

Features

points. It alters the performance of the processor by changing the bus to core

frequency ratio and voltage. This allows the processor to run at different core

frequencies and voltages to best serve the performance and power requirements of the

processor and system. The processor has hardware logic that coordinates the

requested voltage (VID) between the processor cores. The highest voltage that is

requested for either of the processor cores is selected for that processor package. Note

that the front side bus is not altered; only the internal core frequency is changed. To

run at reduced power consumption, the voltage is altered in step with the bus ratio.

The following are key features of Enhanced Intel SpeedStep

Technology:

• Multiple voltage/frequency operating points provide optimal performance at

reduced power consumption.

• Voltage/frequency selection is software controlled by writing to processor MSRs

(Model Specific Registers), thus eliminating chipset dependency.

— If the target frequency is higher than the current frequency, V

is incremented

in steps (+12.5 mV) by placing a new value on the VID signals and the

processor shifts to the new frequency. Note that the top frequency for the

processor can not be exceeded.

— If the target frequency is lower than the current frequency, the processor shifts

to the new frequency and V

is then decremented in steps (-12.5 mV) by

changing the target VID through the VID signals.

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Intel BX80569QX6850 Datasheet Page 99