As you scale from 2->3->4 cards the performance gain decreases. And the performance gain from going from 4 4850s to 4 4870s would be about 5%.Also, Crossfire scales better than SLI
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As you scale from 2->3->4 cards the performance gain decreases. And the performance gain from going from 4 4850s to 4 4870s would be about 5%.
Also, Crossfire scales better than SLI