Yeah, that's mental. Is it just a case of running the 4th card off it or are you going to split the load generally? I've never looked into it TBH. Only recently started buying more than 2 cards, ironic given the price, it was the Titans that got me into Tri SLi lol.
Tri SLI Titans are quite happy to run on a single Corsair 1200i PSU, unfortunately 3 x 290Xs had no problem bringing the same PSU to it's knees.
I will probably run two cards off of each PSU.
Build log please
I will be starting one when I get going.