Multi Thread (MT) problem!

[313Mhz]

thank u for answers.
i just did it and..... amazing!! all games run much better with 10-15 more frames.
from where i can sure that the all cores (4 core) are involved??
when i run the games or load the saves for 2 sec run very smooth and quick, but after 2 sec it run much lower in frames!!
i think in that 2 sec all cores are runing but after it just 2 core run!
do you agree???
or maybe its because of cpu frequancy that change??
please help