Intel 2 Duo T7800 LE80537GG0644M Manual Do Utilizador

Datasheet

21

consumption allows for leakage current reduction, which results in platform power 

savings and extended battery life. There is no platform-level change required to 

support this feature as long as the VR vendor supports the VID-x feature.

The processor incorporates the PSI# signal that is asserted when the processor is in a 

reduced power consumption state. PSI# can be used to improve intermediate and light 

load efficiency of the voltage regulator, resulting in platform power savings and 

extended battery life. The algorithm that the processor uses for determining when to 

assert PSI# is different from the algorithm used in previous mobile processors. PSI-2 

functionality improves overall voltage regulator efficiency over a wide power range 

based on the C-state and P-state of the two cores. The combined C-state and P-state of 

both cores are used to dynamically predict processor power. PSI-2 functionality is 

expanded further to support three processor states:

• Both cores are in idle state
• Only one core is in active state
• Both cores are in active state

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