We already reported about the possibility of dynamic frequencies change in nehalem core in the dependence on the load , and only yesterday intel company opened the details about this frequencies control mechanisms .
Core i7 processors (Bloomfield) will support two key technologies, which allows to optimize the energy consumption: Turbo mode and Integrated power gate. The first will allow to dynamically increase the frequency of the loaded cores in applications, badly optimized under multi-thread. In this case the energy consumption will not go beyond the limits TDP of those processor .
AND electric power saving will be possible using the second technology - Integrated power gate. Due to the integrated advanced power control , the processor will be able to disconnect core (cores) individually. Thus, the loaded core in nehalem processors will be accelerated, while other will be disabled.