I had an issue where having my capture card plugged into the USB directly next to the ethernet port would cause it to run at 100mbps instead of the expected 1000. This was when the card wasn't even in use, but simply plugged in. Is this expected behavior? I've never noticed ethernet being overloaded in the past when using this same capture card on other hardware, but also I could have just been lucky on what plug I was using.
Moving the capture card a row down resolved the ethernet issue, however.