GTX 700 series SLI performance

Hey all,

Real simple - do any of you have any of the 700 series cards in 2-way SLI? If so, has it lived up to your expectations? My research shows that it scales well and gives users what they want, but I want some personal testimonials.

Reason be is my PSU is showing signs of failure (rightfully so after heavy use for 7+ years) and I'm thinking it makes more sense to at least get enough wattage to power my GTX 760 in 2-way SLI if that's the route I go (used, Ebay). And even if not, if I have to replace my PSU, it makes sense to get at least 700/750 watts in case I decide on some SLI down the road in some other series configuration.

PS - I game at 1080p. I don't see that changing anytime soon.

Specs:
i5-4670k (@4.4)
Asus Z87-A
8Gb DDR3-1600
EVGA GTX 760 SC
Enermax Infiniti 720 watt PSU (old)
 
I wouldnt bother doing SLI with the 760. The 770 it may be worth while, but really it only shines with 780s.
You would be best getting a 970 or similar if you were to change graphics.

As for the PSU, you can find some quality 750w units for fairly cheap. (EVGA B2)