How does having 2 Graphics Cards in a Mac pro help if it doesnt have something like Crossfire??

Hi,
I am thinking of buying a Mac pro for visual effects & graphics work.
My question is quite simple, what are the benifits of having to graphic cards in a Mac Pro,
For instance, i am thinking of putting in a Quadro 4000 with a 5870 in my mac pro.
now is it possible for me to set say the ATI 5870 for powering my display and my Quadro 4000 for graphic processing tasks such as rendering stuff, and so on and so forth.
Any thouights will be great.
Cheers.
Ani

You need to find a way to add 3rd aux power connector.
Mac Pro only comes with a mere 2 6-pin connectors, not a lot of power.
Apple has had multiple problems with Nvidia drivers, with support, with say using two 4000s together, which sounds nice and makes more sense (and especially if one wants to run Windows at all where mixing ATI and Nvidia use to be against all the rules, now it seems like it is an Apple issue).
Yes, there can be processing improvements, Adobe Mercury Engine for one, CUDA still has advantage over ATI-Apple OpenCL.

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Thank you.

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OSX and Graphics Cards
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