Also a branding/design feature. I've encountered extended color coding on multiple gaming oriented motherboards: Black for USB 2, Blue for USB 3.1 (so far so s

Also a branding/design feature. I've encountered extended color coding on multiple gaming oriented motherboards: Black for USB 2, Blue for USB 3.1 (so far so standard), Red for persistently powered. That way you can have your phone connected to that port and have it charge overnight, etc.