Are all your graphics drivers and system drivers up to date?
Also what did you use to check your CPU usage? Can you tell if it's maxing out 1 core of your CPU?
Yes, system driver's are up to date, and to check my CPU usage I was using both speed fan and CPU-Z to check each other. Both said I was at 100% CPU usage when fps dropped. To check and see if the game was using all the cores, I was just going off the graphical display in speed fan that shows each core as a health bar, and they were all maxed during fps drop.