Hi.
I have the same mobo and two 780 in slots 1 and 3.For water cooling I use 3-slot terminal,so I think you should do the same-take a 3-slot bridge.between two graphic cards there is 5 slots,so you must take 3-slot bridge:



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Just pay attention to how many spaces are between the slots. They keep changing the definitions of slots. My enthusiast 3 way SLI bridge covered no spacing and two slots of space. It worked just fine for HB, the 3 slot was the only one that did though. Then I go and buy a new MOBO and have a single space and it doesn't work, none of last generations do so I had to buy a 3 slot which after ordering it a few months ago its finally getting delivered today as they are sparse on the US market with only a few places selling them and those that have plenty of them are price gouging, as in double the cost.

So long as you have both cards running 16x, you shouldn't have any probs using the one that comes with the card.

Can't say I've ever had to use a dedicated bridge, or noticed any drop in performance in doing so, from using just a normal ribbon.