Question: Does Risen 3: Titan Lords Support NVIDIA's SLI or AMD's CrossFireX?
Answer: No. Risen 3: Titan Lords is running on the same engine as Risen 2: Dark Waters which doesn't support SLI or CrossFireX.
If you force Risen 3 to use SLI or CrossFireX, the game will split the load of one video card throughout your setup; for example, if you have two video cards in your setup, Risen 3 will utilize 50 percent of each card, with no added benefits.
Opinions: A lack of SLI or CrossFireX support is unfortunate for most Windows gamers, considering a single NVIDIA GTX, which is currently the most popular video card series, is unable to provide a constant 60 FPS experience at 1080p with max settings.