Macbook Pro early 2008 won't go over 1.2GHz CPU speed!!! Help!!!

So I still have this thing and I install coolbook on it to see the cpu clockspeeds. It says 1200MHz even on full cpu load and 800MHz on no load. Then I opened the windows in bootcamp, and guess what task manager and cpu-z along with coretemp also reported it runs at 1200MHz or 1.2GHz on full load!! What's wrong? Help!