Formerly About Advanced Micro Devices Message Board

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Politics : Formerly About Advanced Micro Devices

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To: Dan3 who wrote (73399)	9/28/1999 11:39:00 PM
From: THE WATSONYOUTH	Read Replies (3) of 1573213

Re: "It doesn't mean anything faster than 800MHZ will be a production part (though these would be expected to "test" at 900 or 1000MHZ if they are speced to be stabile and reliable at 800)." In my experience, the typical guard band on these processors is 5% to 10%. The higher number would be for a newer less characterized processor at the shortest end of the channel length distribution.(fastest part) This guard band is to guarantee stated performance over the life of the processor. So, for instance, an Athlon shipped as a 650MHz part would have to have a raw Fmax of at least 709MHz given a 9% guard band. However a part with a raw Fmax of say 760MHz could not be shipped as a 700MHz part if the guard band at 700MHz is 10%. If the guard band is not kept in mind, it is easy to come up with optimistic conclusions. Obviously the lower % guard band the better. I don't know what AMD requires but would expect it is somewhere between 5% and 10%. Hope this helps. THE WATSONYOUTH

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