pebbleberries :
yes but would 2 GTX 1080's in sli beat 3 Titan X's in sli.
Because the GTX 1080 and 1070 only have 2 way sli
Sorry. I mistook your post as 3 numbered lines of text; 1, 2, and 3. (speed reading) I see now you are asking 2-way vs 3-way. The most accurate answer would depend on the board. How many lanes each PCIe x16 slot has. If the 3rd slot is only x4, for instance. Or if the 2nd is x8. And if the CPU can keep up with 3 x hi-end cards. But I think I would still give the edge to the pair of 1080s.