Specs: 4790k, Maximus VII Hero, 16gb Corsair Vegeance pro, evga supernova 850 g2, NZXT H440 and Monitor is 1080p but I will upgrade to 1440...
wow, thats a nice rig, the case should be ok with two of these but one of them will run warmer than it would on its own, usually the top one.
As they have XDMA they don't need a CF bridge so if you do go CF keep them as far apart as you can, they don't need; and really shouldn't sit right next to each other.