I recently started getting some slight audio interference when there's activity on my network card. It's like a sixth sense into the packets flowing over the wire. I can hear how a video stream buffers, or how network-heavy a loading web page is.
I used to get some significant interference from my mp3-player/headphones when my cellphone was about to go off. "2G" (not sure they called it that at the time) interference actually had a pretty good tune to it. da-Da-da da-Da-da da-Da-da daaaaaa.
My zen3 desktop build reused a decade old PSU, and inductors would whine when scrolling in a web browser and stuff. Then I got a 6800xt GPU, and the PSU died the morning after overclocking and stress testing the GPU. The new PSU seems quieter.
A good way to detect a network loop is to stand a bit further from the rack and see if any lights on the switches are blinking in sync. Much quicker to see this pattern than "show interface stats" on telnet and check the numbers.
