Nobody puts a full blown new desktop GPU in a laptop. But it doesn't mean they are "castrated ", they are Mobile chips that are cut down to save power and heat. They are new chips that are spouse to be like that.
Show me a full blown new desktop GPU that went right into a Mobile GPU, then you are right. Otherwise you don't know what you are talking about,
You are amusing too much. As said, who knows, but maybe they were working on 512 because they thought they would need that much to beat the 5870 at that time. The reality shows that 480 was (and still is) enough for that. Why should they beat 5870 by 30% when 10% gives you the lead? But who knows, maybe they got in trouble too, but that's not important now, what matters now is, the GTX 480 beats the 5870 with good enough margin.
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