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Politics : Formerly About Advanced Micro Devices
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To: Petz who wrote (82631)12/10/1999 7:03:00 PM
From: THE WATSONYOUTH  Read Replies (2) of 1573086
 
Re: "If there's a wide variation in Fmax over a wafer, then a 500 MHz wafer may indeed have more than a few chips that will operate at 776 MHz, because the sigma of the normal distribution is large. The overclockers find a few of these chips and report it on the internet.

With good process control, a reasonable within wafer variation (chip/chip) is +/-4%, within lot variation (chip/chip + wafer/wafer) of +/- 7.5%, and lot to lot(all data) of perhaps +/- 12.5%. So unless Intel's famous process control is a myth, this 750MHz @1.6V part which was
shipped at 500MHz was purposely shot there and for whatever reason got down binned. I don't understand it either given the shortage of faster parts.

THE WATSONYOUTH
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