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

Author: Keith Evans

Date: 16:00:28 04/28/03

Go up one level in this thread


On April 28, 2003 at 18:46:24, Jeremiah Penery wrote:

>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.

Take a look at the JPEG file that he provided
<http://www.newageoc.com/pics2/corsair2400cl2.jpg> - it's Micron RAM. Therefore
the best place to go for information is Micron.



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