Looking for HW recomendations

Looking to build a new rig. Thinking about dual GTX 780 Ti cards.
What MB’s support dual GPUs, and what CPU’s are most cost-effective?
I was looking at the X5690’s which give me 24 cores @ 2.46Ghz. They are a pretty good price point vs speed. I know newer CPU’s are faster and have more cores, but they have a higher price point per GHz.

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