Need Help in Build with some parts

Also for crossfire do I just need to plug them in or do I need a crossfire bridge connector or something.


And since my monitor is my 27 inch iMac with MDP can I use a DP->MDP adapter without having issues?
 
Just to say the reason I choose the 2 7970's in my original post is because they are £200 each in the sale tomorrow so I will be sticking with them lol.
 
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