It's not wires; that's really all I have to say. It has been there ever since I built this system, but It never did this until I switched cases. No case fans. Only GPU and CPU rad. 2060 and Ryzen 5 with 16gb of DDR4. SSD and HDD. It used to only click when I played certain games, and it wasn't hard to run games in particular.
View: https://www.youtube.com/watch?v=RQlOJ23WRIE