Reccomended watts for new cpu and crossfire Sapphire 7970s

Hello, I'm kinda new to inquiring on forums so I apologize if I make a butt out of myself!

I'm building a new rig and am wondering if my current Thermaltake 750 watt PSU will be sufficient for the new guts.

The new stuff:

AMD Fx-9590 8 core Black Edition

Asus Sabertooth 990fx MB

Corsair Hydro Series High Performance Liquid CPU Cooler H60

2 Crossfire Sapphire 7970s

I was looking at a Corsair 850w only because a friend of mine who works for Tiger Direct recommended it with my current build but I don't want to spend the extra cash if I don't need to, especially with it being only a 100W jump..

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More about reccomended watts cpu crossfire sapphire 7970s
  1. The 750 watts is ok if it wasn't a Thermaltake.
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