3000 datasheet(91/102 Pages) INTEL

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Dual-Core Intel® Xeon® Processor 3000 Series Datasheet

Features

6.3

Enhanced Intel® SpeedStep® Technology

The processor supports Enhanced Intel SpeedStep® Technology. This technology

enables the processor to switch between multiple frequency and voltage points, which

results in platform power savings. Enhanced Intel SpeedStep Technology requires

support for dynamic VID transitions in the platform. Switching between voltage/

frequency states is software controlled.

Note:

Not all processors are capable of supporting Enhanced Intel SpeedStep® Technology.

More details on which processor frequencies support this feature is provided in the

Dual-Core Intel® Xeon® Processor 3000 Series Specification Update.

Enhanced Intel SpeedStep® Technology creates processor performance states

(P-states) or voltage/frequency operating points. P-states are lower power capability

states within the Normal state as shown in Figure 6-1. Enhanced Intel SpeedStep®

Technology enables real-time dynamic switching between frequency and voltage

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.

3000 Datasheet(PDF) 91 Page - Intel Corporation