I'm on GTX 780 SLI. With SLI on I encounter a lot of frame drops as well. With SLI Disabled the game feels smoother, FPS is about the same as well.

The benchmark runs/scales with SLI amazingly. If you guys actually monitor your card while playing (with SLI enabled) you will be shocked at what's going on. The game/drivers constantly underclock your card in certain areas. GPU usage is very very low. Each card with roughly 40% load.

With SLI disabled everything is normal, load is anywhere from 70-99% and clocks are stable. With 2 780's I score 22500+ on the benchmark, but in game I'm getting 30 fps in Horizon with SLI enabled. with SLI disabled I still get 30 fps. This makes no sense at all.

SLI is most definitely not working properly at the moment, whether its a game issue or a driver issue I have no idea. The benchmark is obviously optimized though. Not the game itself however.