It's very intermittent, but I'm 100% positive it came from 7700Cu.
It would start out fine, with no noise (5V).
Then after a while, it would rattle or click
I stopped the fan and rattle stopped.
Like I said before, no wire or cable was loose or got inside the fan.
and most of the time, the rattle/clicks would dissapear after a while
So far with 12V, I haven't had this problem - but it's kinda loud