VGA hotwire is a feature only on ROG boards, but doesnt require an ASUS card.
This is how it works.
http://rog.asus.com/technology/republic-of-gamers-motherboard-innovations/vga-hotwire/
Remember when I said "reasonable need" in my last post?
Upgrading to a 780 will get you a 780's performance, which is a fair bit stronger than a 760. If your wondering how it will affect you in ways other than straight up performance, it wont.
It really is just marketing. There is a reason why you have heard of this "ROG advantage" but arent able to actually quantify what it is.