Hybrid Gaming/Mining Rig

[Jeteroll]

So I'm building a hybrid gaming/mining rig, and I want to be able to have two of my 7950's in crossfire at at least x8 mode, and then a third slot for another old mining card at x8. Can this board do this for me:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128509

Or do I have to get a Crosshair?
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131876

Seems I need the Crosshair because the Gigabyte one can't run a third card in x8 is this correct?