I guess I'm a Newbie so I have to post this here.
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I am considering building a GPU Mining rig (Yes i know about ASICs). My question is....

How much is a Nvidia GTX-680 over a Diamond AMD 7950? Is there a better graphics card I should be looking at to build a GPU mining rig?
Can either of there cards be linked together? for instance... if I want to buy another card of the same type in the future.

And what type of cooling would be good?

Thanks in advance,
de704