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what CPU would i need to be able to run two 7990's at 100% in games?

I am prepared to take the flame for this but 2 x 7990s is not going to give you a massive amount of extra performance over 2 x GTX 780s or 2 x Titans in SLI. Mainly due to rubbish scaling so you get rapidly diminishing returns. I know you already have a 7990 but just saying. In a similar way I wouldn't put 2 GTX 690s in quad sli except for benching.

So I'd go with a 4770k and 2 x 780s unless you need 6 cores for other reasons.
 
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