DDR stick identification

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I have 2  256MB PC3200 DDR (184 pins) RAM modules that won't work on both of
the P4 motherboards I have. These are brand new Infineon memory modules and
both of them doesn't work, even when I put only one of them on my
motherboards, doesn't matter in which slot I plug them.

These DDR modules have chips with these marks :

The motherboards :
Biostar P4VMA-M  (PCB V.7.2)
Asus P4P800 SE (PCB V 2.0)

I asked tech support of both companies to know if there can be an
incompatibility issue with these memory sticks. Asus didn't responded yet,
but Biostar tech support told me that this board doesn't support high
density memory, so I must check if these modules are High Density DDR

Question :
How can I know if these memory modules are High Density or not???


Re: DDR stick identification

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The very first hit in an Altavista search, returned this datasheet:


That chip is a 32Mx8 memory, and eight chips mounted on one side of
the module would make a 256MB memory module. That should work
with no problem in an Asus P4P800SE, as 32Mx8 memory is the same
chip size used on a 512MB double sided, 16 chip module, which is
the most common module in the industry for DDR.

On this Tyan page, you can see those chips are in the recommended
list for an 875P based motherboard. Very similar to your 865PE


What are the symptoms ? Does the computer beep the front speaker
when the bad memory is present ? Is the computer completely
non-responsive ? It could be that the memory is just plain

From a specifications perspective, I don't see anything wrong
here. There should be a small SPD chip on the module, and if
the module doesn't have an SPD chip, that might upset things.
But only an idiot would make a module without an SPD chip on it.

Also, occasionally, the programming of the SPD chip on the module
will be set up wrong. That can make the BIOS crazy and cause the BIOS
to crash. The BIOS expects the info in the SPD to conform to
the JEDEC specs, and cannot be filled with crap info. But if
no computer will POST with the module in place, there is no
way you can use CPUZ dump function to verify what is in there.

Just a guess,

Re: DDR stick identification

Thanks for the info

The symptoms :

With RAM installed (1 or 2 modules, whereever they are plugged or in which
combination, the results are the same):
No boot, no display, no beep; each fans are spinning.
When using a PCI diagnostic card, the boot ptocess stops at "D7" (Hex) in
normal usage
( a strange fact : When booting just after clearing bios and in dual channel
configuration, this value is "D0" instead of "D7". This happens only in dual
channel config.)
OSC/Frame led isn't on on the diagnostic card
 I tryed with both AGP graphic adapter and an old ATI PCI graphic adapter;
same results in both cases.

Without RAM, just the CPU :
No boot, no display; each fans are spinning.
Beeps continously with this pattern : long, short, short
PCI diagnostic card indicates "E0" (Hex)
OSC/Frame led is on on the diagnostic card
 I tryed with both AGP graphic adapter and an old ATI PCI graphic adapter;
same results in both cases.

Installed CPU is a P4 Prescott 3Ghz with1 meg cache  and 800 FSB. sSpec
number : SL7PM.

I don't want to risk myself to go at computer store to ask their technicians
to test my board again as the last time I did, they just destroyed my board
(the Biostar one, so I just have the ASUS one left) because the tech decided
to flash my bios (he never wanted to tell me why) with the WRONG Bios (and
these crazy jerks claims to be experts... lol!!!). so your help is precious,
as I don't have another compatible CPU or board to do my tests.

So : Can it be a CPU issue?
       A defective motherboard issue?
       Or I just bad, bad memory?

And what other tests should I do?

Thanks for your precious help.


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Re: DDR stick identification


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Normally, this would be a good place to look for POST codes.

http://www.bioscentral.com /

I found this document while looking for POST codes for AMIBIOS8.
I think that is what your BIOS on the P4P800 SE would be.


Now, the trouble is, codes D0 and D7 don't seem to be
too meaningful. I'm not sure the POST codes are going to
help you, unless you can find the right document. While
I think that is the correct one, this is not the first
time I've run into trouble getting reliable POST code

Have you tried any other RAM ? Can you take just your RAM
to the computer store and have it tested ? Have your two
motherboards ever worked before ? You need to work with
stuff that is known to be good, in order to draw any
conclusions, and at this point I don't know if your
motherboards are working ones or not.

Since you got the "long, short, short" beep code, that
means the CPU is able to read some of the BIOS code.
Also, the BIOS POST card results show that the motherboard
is attempting to POST. But why it cannot work with the
RAM, I can only guess at.

Does the memory module itself have a brand name ? You
provided the chip information, but who makes the module ?

I went through a similar exercise with someone else's
RAM problem here. The RAM brand in this case was S3Plus.



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