I noticed this after I upgraded my internet to gigabit and was running a speed test through the speedtest.net Mac app, not through the browser. Basically while the test is running and pulling 800+ Mbps I hear a high pitched squeal like coil whine coming from my machine. I was connected via a USB-C to ethernet adapter. Cannot reproduce this in any other way such as using a Samsung T3 to move a large amount of data quickly or speed test over wifi.
Issue or don't worry about it?
Issue or don't worry about it?