Need help with amd a8-4500m apu

This processor works along with amd's turbo core software. It's supposed to automatically overclock from 1.9ghz up to 2.8ghz under heavy load. 

The problem is with turbo core, ever since i downgraded from windows 8 to windows 7, the processor will no longer over clock to 2.8ghz, the highest it will go is 2.3ghz. I used amd overdrive to see if i could fix the settings with turbo core but it wouldn't let me. 

If anyone has any idea how to fix this, I need your help.

Power consumption wouldn't be a problem, this a mobile processor for a laptop. They're designed to consume the lowest amount of power possible.