Formerly About Advanced Micro Devices Message Board

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Politics : Formerly About Advanced Micro Devices

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To: Petz who wrote (82631)	12/10/1999 8:01:00 PM
From: Elmer	Read Replies (2) of 1572780

Re: "I thought that was obvious. 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. (They don't tell you about the ones that just managed 550 MHz, do they?)" John, I'm confused. There is no such thing as a XXXMHz wafer in x86 processor land. While there may be variation across a wafer, the speed of any individual die is determined at final test and has nothing to do with the wafer. Are you thinking that some wafer level measurement determines the speed of ALL the die on that wafer? Not so. EP

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