is this a perfect or normal core speed of my core i3-2100 sandy bridge, i did not do anything with it, just bit confuse, noob here..
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More aboutnormal core 2100
It's fine. That's the idle speed because of SpeedStep.
Yes, it's running perfectly. For the last few years all the Core processors have employed Speedstep which reduces the voltage and multiplier (and therfore the processor speed) so the processor uses less power when it is idle. It ramps both right back up again when it needs the speed.