Originally Posted by
Ttaskmaster
If it's a high-pitched sort of buzzing, then that is probably coil whine.
Most high-end cards experience coil whine to some extent, or under certain conditions.
Typically, if you run something like Unigene Heaven 4 for benchmarking, when you shut that down and it displays the credits screen, you get coil whine at that point. It then immediately ceases once the screen and app close completely.
This is basically the card processing at a thousand frames per second for a couple of moments. I don't get the full reason behind what it's doing, but it's perfectly normal and just how it works.
Some people lessen the whine by coating their coils in hot-melt glue.
If the buzzing rises and falls in pitch then it may be something else...