From what I have determined the sound only occurs when my GPU gets up to 70c. I have not ran any benchmarks but assuming that higher temp = higher load, I am guessing that I am stressing my card and using more power which leaves the GPU and PSU as potential problems.
The sound makes me think that the fan on the GPU is possibly off balance and at higher RPM is rubbing on the heat sink. It is a buzzing sound that occurs every 1/2-3 seconds, mostly lasts for an 1/8 of a second or less and I'm almost positive that its plastic rubbing on something. However I'm not ruling out the possibility that its is electrical. The one thing I have not been able to determine is if the source is the GPU or PSU.
Any ideas what it could be? If its a GPU fan should I get it fixed or is it just a small annoyance that I only notice when I'm not wearing headphones? What benchmark should I run to try to replicate it? (Please link) If I can replicate it I will record it with my phone.
So far it has occurred while playing Metro 2033, Witcher 2, and Warframe.
To see if it is the cpu fan disconnect it from the motherboard for a few seconds as the noise is happening the temperature should not rise too much if it is only a few seconds.
Whichever it is it is likely you will need a new fan as this is a symptom of a fan bearing wearing out and it will only get worse and may stall .
To test the PSU place a screwdriver handle to your ear and the blade to the metal casing and if it gets louder then it is the PSU.
Its definantly not the CPU fan or any of the case fans. A baring does sound like it could be the issue however and I will try to determine for sure if its GPU or PSU next time it acts up. I am leaning toward GPU however.