If there truly is a shader increase to 1600 and similar clocks, I'd expect the 5870 to more than match the X2 ( given the lack of multi gpu scaling inefficiencies as well as arc improvements ) Given they are getting so cheap now like you've shown, I think they could go as far as charging 400-450 for the 5870. $300 with no competition wouldn't reassure me of its performance.
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