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To: Saturn V who wrote (77339)	3/27/1999 3:16:00 AM
From: Jeff Fox	Read Replies (1) \| Respond to of 186894

Saturn V, re:"Customers very sensitive to reliability of a chip may demand that their chips have this Chip ID feature and that the manufacturer send them parts from the "Prime Yield" areas. [ This may give the word prime cut a new meaning.] Such customers would obviously pay a premium for their Prime Cut." In a word - no - not a chance... Jeff

To: Saturn V who wrote (77339)	3/27/1999 1:34:00 PM
From: Tony Viola	Respond to of 186894

Saturn V, The Chip ID has been used to perform a massive study of 'Reliability vs Yield Issue' which is dear to your heart. Thank you, thank you for your post on the article and your summary of reliability vs. yield, and even reliability vs. position that die come from on a wafer. Sometimes one thinks one is yelling down a manhole on some concepts. You are the second one to validate the Yield/Rel. correlation. Paul E. was the other. I'm surprised Intel doesn't use their vaunted process/manufacturing engineering producing the highest yields, hence reliability, story more. Tony

To: Saturn V who wrote (77339)	3/28/1999 8:33:00 PM
From: Tenchusatsu	Read Replies (1) \| Respond to of 186894

<Since the Chip ID easily allows the Chip maker to determine whether the chip came from a high yielding area or poor yielding area. This allows the chip manufacturer to know in advance how reliable the part will be.> While this may have a lot of applications from the point-of-view of a chip fabrication plant, I doubt that the OEMs, and hence the end consumer, is going to make much use of the CPU ID in this aspect. However, I'll bet hobbyists out there are going to try and decipher that CPU ID code to increase their chances of successfully overclocking Celerons to ridiculous speeds. It could go something like this: "If you want to overclock your Celeron to 1 GHz, make sure you buy a Celeron with a CPU ID that is divisible by the number 128." Tenchusatsu