How do I put graphic card in my computer with sound card stuck with it?

As of now I am just questioning (didn't decided yet) Card I'm going to get: AMD Radeon 6670 This is how my computer looks back view: http://www.pcmag.com/slideshow_viewer/0,3253,l%253D289067%2526a%253D288657%2526po%253D6,00.asp?p=n as you can see the sound card and the video card are together??? I... show more As of now I am just questioning (didn't decided yet)

Card I'm going to get: AMD Radeon 6670

This is how my computer looks back view: http://www.pcmag.com/slideshow_viewer/0,3253,l%253D289067%2526a%253D288657%2526po%253D6,00.asp?p=n

as you can see the sound card and the video card are together??? I don't know what to do. I want to change graphic card without changing sound cards.
Update: @Arnak ohhhh now I get it thank you so much

Also one more thing. If I were to install a new graphic card how do I make the computer use (default) the new graphic card than the old one?.
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