Thunderbolt was supposed to go optical. You can read about it here, under &quot;Copper vs. optical&quot;:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Thunderbolt_(interface)" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Thunderbolt_(interface)</a>