#18148
There are some interesting tricks that you can pull with Hybrid Crossfire that are unavailable with normal cards. Other than the 780G supporting two monitors and a second GPU adding two more, they team up in some new and different ways. The card that you plug the monitor into becomes the master, and when the need for speed goes down, the machine will idle the slave part to save power. This is a carry-over from the laptop hybrid variants, and what it means is that controller location does not matter.
Initially, this power saving is driver controlled, but over the next year, there will be more additions to the tech allowing it to pull more tricks like passing data across bus so you can more or less put the master card to sleep and drive video from the slave if that would save power.