Since we're on the subject, and even though Cat 7 or Cat 8 cables are not mentioned, some may find this article informative:
What makes a good Ethernet cable for audio applications?
Here's what audioquest has to say about one of their lowest quality ethernet cables. This is the one I'm positive I heard an audio performance improvement on. It was easy for me to perform numerous quick A/B comparisons, when switching back and forth to my standard Cat 5 patch cable, and this Pearl. Call me crazy, but I know I heard a sonic improvement.