GTX 780 ti sli compatipility

[digthis2]

Hello,
I am planning on buying another 780 ti for my rig since most of them are getting huge price cuts. I have a reference card in my rig right now and I do not know what will happen if I were to put a different model card like an Asus DirectCU II or a card with Evga ACX cooling. Also, if I can put a different card in my rig which one would be the best for sli? Any help will be appreciated!
Thanks!

 

[Mousemonkey]

Any 780Ti from any manufacturer will work just make sure it has the same amount of Vram.