Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 231.86

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9:51 AM EST

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To: dale_laroy who wrote (39419)	5/13/2001 11:05:00 PM
From: dougSF30	Read Replies (1) of 275872

How can your estimate change from 158 to 191 die per wafer with no change in estimated die area? Did the wafer get larger? Shouldn't we be able to use some geometry here, anyhow? What's the wafer diameter? 8 inches? (I guess its 200 mm) r = 4in = 10.16 cm (edit: 10 cm) A = pi r^2 = 324.3 cm^2 (edit 314 cm^2) Now I guess estimating edge waste is more interesting... assuming say 20 wasted die-fulls (high? low?): 324.3 / (192 + 20 ) = 1.52 cm^2 = 152 mm^2. Big. Perhaps my waste estimate is low... but still. Edit: 314 / 212 = 148 mm^2 hmm. Is this all from that AMD photo of the wafer in the A4 diectory? We should know soon enough I guess... Doug

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