Whenever I'm playing a game, my framerate will drop periodically and after a few seconds, return to normal. Using afterburner, it turns out that when these drops happen, my GPU usage decreases while my CPU hits 100%. When my framerate returns to its original state, the CPU usage drops and the GPU usage increases, both to normal levels. This is really irritating.
Specs:
CPU: FX-8120
GPU: R9 280X
Not sure what else to include