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Getting a second 4890 would do plenty for your i7 setup, it's faster than a single 5870, but its not headache free.
considering you have never run a crossfire setup before the best option imo is to sell the 4890 while there are still people interested. But if you solely CBF then 4890 is a decent alternative, it still kicks ass etc. but remember its not smooth sailing, you may run into various hiccups in crossfire as its not perfect technology.
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