Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
In article <2nrklvF41duuU1@uni-berlin.de>, "Peter Wagner"
<NG.Basket.PeeWaa@xoxy.net> wrote:
> Paul wrote:
> > In article <2nncleF2kiauU2@uni-berlin.de>, "Peter Wagner"
> > <NG.Basket.PeeWaa@xoxy.net> wrote:
> >
>
> Thank you your for your answer.
>
> >
> > Use the Auto setting, then use a Windows utility to verify the
> > memory timings. Compare the values to the values printed on the
> > retail packaging. If the timing values seen are not correct, use
> > manual mode to set them up correctly.
>
> Do you know a free Windows utility?
http://www.cpuid.com/cpuz.php (click "Memory")
Sample picture of memory info:
http://www.abxzone.com/forums/attachment.php?attachmentid=7213
>
> >
> > The SPD on the DIMM determines what happens when the Auto setting
> > is used. Many memory module manufacturers don't state what is in
> > the SPD.
>
> What means SPD?
Is is called Serial Presence Detect. It is a small, electrically
erasable 8 pin device, with a serial interface on it called
"I squared C". The processor uses the serial SMBUS (system management
bus) to query this device on each DIMM. The SPD chip contains the
timing information for the memory, and that is how the BIOS knows
what to do, when the memory is set in the BIOS to [By SPD].
Since the SMBUS is separate from the memory bus, the memory does
not even have to be working, for the BIOS to be able to read the
SPD chip. Once the timings are set up on the memory, then the
memory bus is enabled for normal business.
>
> >
> > If you want to see an example of what is stored in the SPD, see
> > page 28 of this document, a datasheet for a 512MB double sided
> > memory module:
> >
> >
>
http://download.micron.com/pdf/datasheets/modules/ddr/DDA16C32_64_128x64AG.pdf
>
> Thanks.
>
> >
> > HTH,
> > Paul
>
> p
HTH,
Paul
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