Anyways does anyone know if I can trifire the Asus directcu 2 , 3 slots card on a rampage 4 extreme?
No, three of those cards will not fit in any motherboard. I would go for a two slot card, like the one from Sapphire, especially if you want three cards (although there is diminishing returns and I don't really recommend wasting the money). Two cards should perform just fine.
I guessed I will get the direct cu ii top 7950 then