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The cards you have now are sort of 2.5 slot cards.
Which PCI-E slots on the motherboard are you using and which slots do you plan to put 3 cards in?
They take up 3 lanes, so its every 4th lane, im going to sell my board to a mate and order this..
http://www.overclockers.co.uk/showproduct.php?prodid=MB-037-EA&groupid=701&catid=5&subcat=2174
Its the only x79 board i can find that will do it, will just need to move my psu to the top so the card can hang etc..
I don't think you need a new board as it looks like you have the same mobo as me(rampage iv extreme),I've considered a 3rd card and if you look on pg 2-10 of the user guide it shows you tri sli with 3 slot cards.Hopefully i've not misread and this helps![]()