i7 3770k @ 5ghz
GTX 780 SLI @ 1071/6500

You're not the only person experiencing weird FPS issues. I have a system that should be easily capable of running any setting I want. There are a lot of unoptimized areas and SLI doesn't even work properly 90% of the time. Also introduces weird micro stutters and slowdown.

It's the game not you. Trust me.