Doesn't work that way. Every 3-core part will be a defective 4-core part, and that word *will* get out. It's when you have some of each (meaning 3-core dies working fully + 4-core dies partially disabled/defective) that you can get away with it.
Finally, the X3 boosters might note that AMD has made no mention at all of such a part on any roadmap.
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