You will need to get into the system BIOS to change that. Reboot your computer and press the DEL (delete) key after initial POST. Once in the BIOS, go to the menu called Power Management Setup. You should see an option for AMD Cool 'n' Quiet somewhere near the bottom. You can set it to AUTO, or Disable......you want to choose AUTO. That should do it.
Edit: By the way, you can find this information in the manual that came with your motherboard. Section 3-2 has instructions for how to get into BIOS, and section 3-20 will explain AMD C&Q.