Mac pro graphics card question

Hello, I am ordering an apple Mac Pro tomorrow and I need a question cleared up.
If I get the 4x ATI radion 2600 HD (4 graphics cards) If I hook up one monitor will 1 graphics card take up 1 forth of the screen or is this meant for people with like 4 screens?
Thank you

One graphics card can run two monitors. Four graphics cards could run 8 monitors. Four graphics cards will not run one monitor any faster than one graphics cards. Unless you plan on running three or more monitors, even a second graphics card will be money wasted.

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    com.apple.iokit.IOATAFamily 2.0.1
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