2x+ the speed of a GTX 285(not sli, literally double or more performance) will put a single GTX-380 far above the 5870(40 to 60%, if not more), and a simple overclock of the 5870(5890) is NOT going to catch it.
I concur with everything you said except this. If something has taught us the 5870, is that doubling everything up doesn't translate always in doubling performance. Even without having the SLI/CF handicap
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