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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 231.80

+1.7%

Jan 16 3:59 PM EST

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To: Bill Jackson who wrote (21769)	12/7/2000 11:02:58 AM
From: pgerassi	Read Replies (2) of 275872

Dear Bill: How do you come to your figures? From efunda, the density of Si is 2.33kg/l (liter) for normal silicon, and that includes some Si29 and Si30 within so, it is an upper bound. Thus a cylinder of Si28 with a diameter of 200mm and 100mm high has 3.142l in it. Thus the mass of that cylinder is 2.33*3.142kg or 7.32kg. At $75K/kg, that comes to $549,000 for the cylinder. At a thickness of 1mm per wafer, and that is generous, that works out to $5,490 a wafer or at 200 good die per wafer, $27.45 a good die or 2/3rds of your quoted cost. At a thickness of 0.36mm for the wafer, it would work out to just under $10 per good die. Their (Isonics) numbers do not seem to be that far off. Pete

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