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I might be able to let you know once my 970 arrives
Getting ENB to work property was one of the things which prompted me to take the plunge for an upgrade.
What CPU are u running , I don't play the game at all but understand is CPU bound . May be that your bottlenecking , may be going over the vram limit and or the game dosnt support SLI very well if you use sli. Check with one card and then retry othar than that I'm unsure
So basically two 280x's?
Depends on which ENB you are using. With a GTX 780 at 1440p I always have to "tame" my ENB of choice by changing settings here and there to help with performance. Most ENB authors don't really care for performance so a lot of things are left at the max quality setting even if they do nothing in game.