Yes the game has awful SLI support but to be fair I haven't played a single MMORPG with good SLI support,

I ended up selling my Reference GTX 780 SLI setup and going for an aftermarket design that overclocks on the higher end. I'm just sick of games not properly supporting SLI. With the gaming era we're in today, most games are optimized for consoles only.

My performance with a single card is drastically better than SLI ever was. I get less frame inconsistencies now. I can still drop to lower 40s in very popultated aetherytes, but I don't get any 20-30fps anymore.