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There is a 5850 and 5870. Is ati going to follow the older versions and make a 5890? would be interesting to see what would turn out if they did.
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I dunno about the 5890, the 5850x2 and 5870x2 should take care of the performance points above the current 5870. However, I think the real question should be is there going to be a 5790 ? there is currently quite a big gap in the DX11 GPU line up between the 5770 and the 5850. In my humble opinion I think certainly in the current market a 5790 half way between the 5770 and the 5850 would be the choice card for many.