GPU needed for second window

I currently have a 770 SLI system and it runs pretty smoothly all over, some issues in stations and such but nothing bad. I also have a young son that likes to watch me play and obviously that can't happen with the rift. Running it in extra window mode though is just too much for my system.

What GPU combo would be needed to run it smoothly in all three without completely gimping the graphics?

Could a 970 SLI do it? Am I talking a titan here? Just wondering if its something I could do or not.
 
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