Well this game has terrible scaling as far multi-GPUs are concerned. Two-Way SLI is great - most of the time at > 90% usage across both GPUs.
However, there are some serious issues with the game freezing randomly; my systems are rock solid and my OC's have been tested to be completely stable.
I noticed that it is only this game that freezes (with the sound still going in the background).
One big difference I did notice is that using G-Sync in this game (on my X79 Beast)...