I made my pc about 3 years ago, it uses a gtx 970 and Intel Core i5 4690 3.50GHz Socket 1150 6MB L3 Cache Retail Boxed Processor for a CPU, when i started out the fps in games like league was ~200 fps now its dropped significantly to about 10 fps at the least, im not sure what the problem is but im assuming it might be due to the cpu heatsink paste in need of a renewal, is there another issue that could be causing this problem?