The Guru of 3D published a review on the GeForce GTX 1080 2-way SLI
A quote from the article:
Two weeks ago we had a peek at the GeForce GTX 1080, this round however we bring in the big guns, as in plural. We will arm our big daddy PC rig with not one, but two GeForce GTX 1080 cards and zoom in at SLI performance for the GeForce GTX 1080. In this review we'll run the standard benchmarks, but we will also have an even closer look at Ultra HD gaming performance as well as a micro stuttering analysis with the help of FCAT.GeForce GTX 1080 2-way SLI Review @ Guru3D
Before we start please read this a HUGE note; this will be article is revision one. The early 368.25 driver does not seem to support SLI for the majority of games, hence we'll look at a handful of games in this preliminary revision of the article first, once a proper final SLI supporting driver is out, we'll add the rest okay ? So this is us jumping the gun to push some results out, not blaming Nvidia.