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crossfire and sli are very particular about the cards you pair together. if you got a replacement, for the best chance at success, it should be exact make and model.
there is no need to run two video cards these days. one powerful card will run anything you throw at it.
give me an idea of what your budget is, and what kind of resolution / games you will be playing, and I'll throw you the most ideal card for the scenario.
I'd have to look up what power supply is in that particular dell as well, to ensure you can get a modern video card powered up
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