in gaming, the gains are more like ~20-90% : http://www.babeltechreviews.com/gtx-1080-ti-sli-performance-25-games/3/ http://www.babeltechreviews.com/gtx-1080-ti

in gaming, the gains are more like ~20-90% : http://www.babeltechreviews.com/gtx-1080-ti-sli-performance-25-games/3/ http://www.babeltechreviews.com/gtx-1080-ti-sli-performance-... Another more well-known source: https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_SLI/20.html https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_... at 3840x2160 there was an average of 171% performance across games when they excluded the ones which didn't scale with SLI at all.