All Games Dropped FPS Drastically

PC Specs:
-i7 3930k Processor
- Intel BOXDX79SR Motherboard
-EVGA Geforce 560 Ti Graphics Card
-EVGA Geforce GT 620 Graphics Card
-Cooler Master HAF X Full Tower
-OCZ Z Series 1000W Modular 80PLUS Gold High Performance Power Supply
-CORSAIR XMS3 8GB RAM
-LG Blu-Ray Burner WH12LS38
-180GB Intel 520 Series SSD
-1TB Western Digital Caviar Black
-1TB Western Digital Caviar Green
-500GB Western Digital Caviar Blue

All of my games have been running 150-200 fps constantly, but just the other day, ALL of the games randomly dropped to a constant 30 and lower fps. I play CS:GO, COD, and many other games like that. I changed my graphics settings to see if that was the problem, nothing happened. Anybody got anything??
 
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