Question about SLI and power consumption

[MatrosRx]

I have a 750 Watt PSU for my SLi GTX 970s. But they consume much less power than older cards, so I would say you would want at least 850 Watt.

I'd say you are better off just getting a new card and ditching the old one. The 900 series has been really good, they run cool, consume much less power but are much more powerful.