Is it possible to add my own fan into my PSU? I just bought this 500w Xfinity and it makes some vibration noises that really annoy me. I know if I take apart the PSU it's not under warranty anymore, but it was $60 with a $50 rebate so I think it's all good. What I want to do is completely turn off the 120mm fan inside the PSU and put in my spare 80mm fan as an exhaust. Anyone do this before, any suggestions? Thanks.