Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 221.06

-1.1%

Jan 5 3:59 PM EST

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To: Ali Chen who wrote (59291)	10/19/2001 3:28:40 PM
From: Bill Jackson	Read Replies (1) of 275872

Ali, someone quoted 315 candidates as the dice on an Athlon wafer and I figured that 250 would make it or about 80% yield. As for finished wafer costs, what does a raw wafer cost? $2500? $2500 strikes me as a little high too. I wonder if a partial wafer can be used? By that I mean a wafer that breaks at sawtime and you end up with, say, a half a wafer. If it can be held and stepped through the processes you would be able to make a lesser number of dice from it but you would avoid a throwaway wafer. Broken wafers can come from in house breakage as well as the wafer makers place if he sells them at a lesser price commensurate with uusefullness. Possibly the funny shape would prevent it from being held rigidly and properly in the fabrication boat or whatever they call the fixture that transits with the wafer and holds it in a fixed position. I would suspect they need to align it with precision, so maybe all they can do with waste wafers is make solar cells, or remelt them. Bill Bill

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