AMD is now paying by the good die, no longer by the raw wafer. I would think this lowers their cost.
Global Foundries will still be charging more per die for larger die, and the negotiated price is still based on where GF estimated yield to be. AMD only makes off with lower costs if they anticipated lower yields than what GF anticipated (when the negotiated price was fixed), and they were right about the yields in fact being lower.
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