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The PS3's installed base should cover 5-6 million in sales for GT and that is already a stretch to think about with PS3 sales. I don't think GT5 will beat Halo 3. I think it's the only PS3 game that will come the closest to Halo 3's sales which by the end of the gen Halo 3 should have 11 million copies sold and GT5 should have like 5-7 million.