Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 215.15

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9:30 AM EST

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To: Petz who wrote (156273)	4/14/2005 2:04:10 PM
From: Ali Chen	Read Replies (1) of 275872

Petz, "If it was "defectivity" rather than "defect density" it would mean..." None of the above. There is a new effect in semiconductor manufacturing at deep sub-micron level, called "transistor variability", check slide #2 here sigmicro-online.org The effect became noticeable in 90nm ramp in 2003, as per publications of Intel's Fellow Shekhar Borkar, google for "Shekhar Borkar exponential challenges" The writing on the wall was very clear, but apparently was ignored by higher management. I believe the reason for this across-die variability is in vastly emphasised statistical nature of thermal processes involved at deep submicron semi-quantum level, which I have mentioned on this thead many times before. In short, depending on local distribution of "variability", a die could be fully functional but very leaky and slow at target voltages, but it can be re-used at much lower voltages (and somewhat lower frequency) as, say, mobile part. - Ali Disclaimer: The above conjecture is solo speculation on my part since I never worked for any FAB, just general observation based on elementary physics.

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