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Subject: Re: -75 part not rated for CL=2 133 MHz clock rate. Need -75Z part for that

Author: Jeremiah Penery

Date: 15:46:24 04/28/03

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On April 28, 2003 at 15:04:58, Keith Evans wrote:

>On April 27, 2003 at 10:40:10, Aaron Gordon wrote:
>
>>>>timings, the ram would be still running UNDER spec. If you'd like to see for
>>>>yourself, here is the PC2400XMS CL2 datasheet from Corsair.
>>>>
>>>>http://www.corsairmicro.com/main/products/specs/cm64sd256.pdf
>>>>
>>>>The numbers off of the dimm = CM64SD256-2400C2
>>>>
>>>>If for some reason you'd like to see the DIMM, go here..
>>>>http://www.newageoc.com/pics2/corsair2400cl2.jpg
>>>
>>>Then the question remains, why did the manager apparently believe that something
>>>would be operating out of spec? That corsair datasheet doesn't have enough
>>>detail. See page 50 and associated diagrams in the following:
>>>
>>>http://download.micron.com/pdf/datasheets/dram/128Mx4x8x16DDR_D.pdf
>>
>>Running 150MHz CL2 ram at 133MHz CL2 isn't going to put it out of spec.
>
>Looking at the JPEG that you posted it looks like the part number for the Micron
>DDR SDRAM is 46V16M8-75B. Without any "Z" after the "75".
>
>That part is not rated for 133 MHz CL2 operation, you need to run it with CL=2.5
>for 133 MHz. If you want CL=2 then lower the frequency to 100 MHz.
>
>This is from the cover sheet of the Micron specification which I posted.
>
>If there is a "Z" on the package after the "75" that I missed, then I agree with
>you.

Corsair is not Micron.  Their datasheets are not the same.



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