Is an 850W power supply enough for 2 way SLI and overclocking

Netty Swobb

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Jun 17, 2015
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I will soon be doing my first gaming build: http://uk.pcpartpicker.com/p/8Tbn4D

I'm thinking a few years down the line, but I may eventually end up getting a second 980 Ti and overclocking to squeeze some extra performance out of it. I originally intended on getting a Corsair RM850W power supply, but I'm now thinking it's not enough. According to PC Part Picker the estimated wattage would reach 704W with two way SLI, would the extra 146W be enough for overclocking? Or would I need a bigger safety margin?