I think you are confused. AMD has no plans to advertise them as defective so 3 core parts will apear to be 3 core parts to Joe Schmoe.
"Thus all 3-core parts would be known to be partially defective quad-cores by default."
Known to who? The consumer won't know unless you tell him. Are you worried INTC would start a smear campaign to discredit the 3 core processors? Short of that the consumer won't have any reason to think twice about it.
Furthermore anyone able to figure it out on their own should be able to figure out if the price makes it worth paying for the extra core.
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