I've noticed a faint whine coming from my pc when I archive a folder for example, or after a cpu intensive operation, after windows loads, or even in game menus. The sound is not intense and it's not annoying. For example if I stress the cpu with prime95 for 10 seconds, and suddenly stop it, this whine can be heard for 3-4 seconds and then it stops. I just want to know what is the source of this sound and if I should worry about it.
Does it have something to do with the cpu changing it's multiplier ?