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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 259.65+2.3%Jan 23 9:30 AM EST
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To: jspeed who wrote (217307)11/30/2006 9:27:30 PM
From: THE WATSONYOUTHRead Replies (2) of 275872
 
Well, that's all very interesting. Based on 143mm^2 die size and 16.5% edge/kerf loss for that size chip, I would estimate 426 total possible die per 300mm wafer. 75% yield gives 319 good die. How about that.... same as Otellini's hypothetical case.
Now for the much smaller 81mm^2 Cedar Mill, I estimate 765 possible die using a 15% edge/kerf loss for the smaller die. Of course the smaller die will yield higher given the same defect density. In fact up to about 84%. That's 642 good die or 321 dual cores. Gee....almost exactly the same number of dual cores from one Cedar Mill wafer as CWM. So here is a real tough question. Which same yielding chip would Intel choose to make? CWM or dual core Cedar Mill? Come on guys, the CWM yields can not be any where near 75%. In fact, I think 75% just happens to be where the yields are in fact the same. Now, we need to find a combination of yields that are significantly lower and cause the dual core Cedar Mill route to have maybe 23% better yield than the CWM route as implied in the article. Lets see . I estimated 44% for CWM. That's 187 good CWM per wafer. I estimated 60% for Cedar Mill. That's 459 single core or 229 dual core. 229/187 is 1.225 I think maybe this was the point at which Otellini ripped up the charts. Now why do you suppose that was. The world needs to know.

THE WATSONYOUTH
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