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To: Elmer who wrote (59744)	7/12/1998 11:25:00 AM
From: Jeff Fox	Respond to of 186894

Elmer, re:"Burnin. A poorly controlled fab..." Thanks for adding this important step. Burnin can be both very expensive and also a major bottleneck to production. You see, if you MUST do burnin then each chip must stay awhile in the burnin "motel". Each part must have a socket on a special high temperature burnin board. Burnin boards are custom made and only useful with a single chip type. These boards are hugely expensive; so a company does not want to buy more than is absolutely necessary, and they and take months to fabricate. While ramping a chip with burin there are always a shortage of burnin "rooms". To increase production rates the company must buy new boards three months ahead, but pay for the board now. When you see the cost of goods rise with increasing production you can figure burnin is a big chunk of the hit and it is not unusual for the burnin throughput to be the limiting factor to shipments. I offered this info on the AMD thread months ago. It was received with the normal derision and insults, then dismissed. Ce la vie :) Elmer, your comments on testing are also right on. I have nothing to add to it... Jeff