How many watts?

FunkyFeatures

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Mar 3, 2014
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I calculated a system in coolermasters psu calculator.
It recommended 650w for dual r9 290 and xeon e3 1230v3, one hdd and 2sticks of ddr3 ram.

Now i dont trust getting only just enough, but would a 750w be enough? Currently looking at xfx's proseries xxx edition powersupplies.

I will be adding the second r9 290 maybe (might not even do it) a year or two down the road.
I do not own any of these parts yet. I will do the build in the summer.