PC Running Extremely Slow

Saixiori

Commendable
Nov 20, 2016
1
0
1,510
Built my PC around a year and a half ago and it is now running extremely slow on almost all games. On games where it would previously reach 300 FPS on ultra (League of Legends) I am lucky to get 8-30 FPS on the lowest settings. It also drops frames constantly. The exception are extremely light games such as the Binding of Isaac. I also replaced the power supply around half a year ago because it burned out (I believe this is where the issue began but am not sure). I also have scanned my PC numerous times with multiple anti-viruses. If anyone could help me I would be extremely grateful.

OS: Windows 8.1
GPU: GTX 970
CPU: i7 4790
PSU: VS550
RAM: 16 gb