I don't think it's performance, I think it's like nV's GF6800GT strategy, price them at the bare minimum or near a loss simply to move large enough volume to get production ramped up to the point where the margins increase due to production savings. That's a wild guess at pricing, but if you're seen to be behind the other company, then what better way to boost sales than by coming out with a very competitively priced product?
Of course it also leads us to believe that the X1800XT-512 won't be so much better performing than the GF7800GTX to justify a very large premium, just the premium over street price. Of course that might not be the case either since if they can reduce per-chip costs due to the process shrink (excluding the terrible R&D phase) it might be noticeably powerful, but this price still gives them a good mark-up and returns them to good margins that were lost in the last gen.
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