No. The cabling is internal using something called a "bridge" (SLi
). It connects two identical (nVidia) or same series (ATI) cards together to act as one/in sync with eachother.
Edit: It wouldn't make sense to use your method as you aren't increasing the total GPU power. Which is why SLi/CF makes more sense. Lots of people do it. It won't "double" your performance, but it'll sometimes get close.
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