Question PSU wattage for SLI

[Trigg3rHippie]

Hi guys, I'm looking to add another Asus Strix GTX 1070 to my setup:

Maximus Hero X
9700K stock
32GB RAM

Cooler Master PSU calculator says 609/659W with 2 x GTX1070 (+ every bit included)
I've got a Corsair TX 650W. As not everything is running at the same time I think I should be fine. Can you confirm that/advise?
Thanks!

 

[shknawe]

It is wise to always use a psu with 60-80% more of estimated need. So a 660w need should require 700-750w psu.