Any idea why dolphin makes my cpu always run at full power

[vsub]

I'm using 4.0-3964(I don't have any special reason to not use the latest beta)on Win7 Ultimate SP1 x64 and no matter what options I set,the emu is making the cpu to always work at full power\speed with turbo enabled
(even tho the cpu usage is low and if I disable the fps limit,all of the games I tried can run at at least 3x normal speed(3x-10x and even more))

Even if I limit the speed to 50%(1600Mhz),I still have way above full speed on any game I tried

This increased the temp little by little