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Politics : Formerly About Advanced Micro Devices
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To: Kashish King who wrote (26729)12/14/1997 10:31:00 AM
From: Bill Jackson  Read Replies (1) of 1575171
 
Rod; When a wafer is made will all the chips that work be of similar speed?, ie does an entire wafer end up as 233 or 200 or 266 etc. Or will there be a full spread of speeds with a 166 next to a 233 etc. Or will there be a fast edge and a slow edge with a gradation between them? I realize that a hefty % will fail outright, but are some of the failures just too slow?, they will only run at <50 MHZ, and are thus failures even as they work at the slower speed?, or are most failures air grit or what other mechanism?. Is there a list of how many chips work from each wafer(an average), and what speeds each one is, and what was the failure mechanism for each failure? I assume they must study these patterns as part of the speed up, has any of that confidential data made its way out for Intel, AMD, Cyrix?

Bill
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