Intel X3480 BV80605002505AH Data Sheet

94

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

CC

 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

CC

 is then decremented in steps (-12.5 mV) by 

changing the target VID through the VID signals.