PC players have reported issues with both locked framerates and the lack of SLI support for Titanfall.
Framerate drops, severe artifacts and crashing of the game are just some of the issues reported when playing Titanfall with SLI enabled, or in certain configurations.
Respawn has announced a fix is on the way in an upcoming patch on Twitter. Vince Zampella confirmed this is the case although no ETA has been given.
If you're having issues with multiple GPUs in Titanfall, we're aware. Should be fixed in an upcoming patch. #Titanfall
— Titanfall (@Titanfallgame) March 11, 2014