Datasheet

Features

94 Dual-Core Intel® Xeon® Processor 3000 Series Datasheet

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.