Makes no difference the fan can still be bad. If the fan is clean and if there is nothing rubbing against the fan blades but the fan exhibits periodic noise; then it is defective. The reasons fans make any noise (other than normal air flow sound) is if they are very dirty, have some object that rubs against the spinning blades or are defective. One other possibility is the fan is not tightly secured to the case or whatever else it is mounted to. Is this a case or cpu cooler fan? Either way get a new on and replace it.
No signifigant GPU or CPU temp spikes... Think I'm ok.