My PSU is a Corsair HX850. While playing a game, I noticed when my fan curve cranked up the GPU, my PSU started to buzz. Like, fairly loud buzz. I tested this in Unigine. Whenever the GPU fan cranks up, the PSU starts buzzing for short periods of time, after each period I can heard a faint high pitch. Is this damaging anything? Should I send it in for a replacement?