Re: RAM compatability

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t@k wrote:
Paul said...

Do the modules have part numbers on them ?

Did you verify the modules are DDR2, and the right spec ?

"Practically fall in" does not sound good.

Do they have the right number of contacts, same as the original module ?

I hope they haven't damaged the notebook...

Thankfully no damage has been done.

Pics of original and replacements...
http://picasaweb.google.co.uk/fade2gray.uk/DDR2SODIMMRAM

Extract from sellers reply to my complaint...
Regarding compatibility, if we did not reply to you does not mean that it is compatible.

Regarding the modules, as far as we understand, it is not compatible, You need the 533 and not the 667. Usually the 667 are backward compatible, but it does not seem to be the case. Also, if both dont work, we think it is incompatibility.

What we can do is replace them for 2 of the 533 1GB modules.

Personally I think they're both duff - I might take them down PCWorld and ask if they could heck them out for me.

Just hope the seller will cover postage and re-imbure me the difference.


The Ebay module looks like (16) 64Mx8 chips for 1GB total. These look to be
the chips used.
http://www.samsung.com/products/semiconductor/DDR_DDR2/DDR2SDRAM/Component/512Mbit/K4T51083QC/K4T51083QC.htm

The original module is here with (8) 32Mx16 chips for 512MB total.
http://www.samsung.com/products/semiconductor/DDR_DDR2/DDR2SDRAM/Module/SODIMM/M470T6554CZ3/M470T6554CZ3.htm

Here is a picture of a 945GM based computing device, and it is
pictured with both a 2Rx16 (two ranks, of x16 bit devices) 512MB
SODIMM (that is the one you've got) and a 2Rx8 (two ranks, of x8
bit devices). So at least this gives the impression that a 16 chip
SODIMM would work.

http://www.radisys.com/products/datasheets/Procelerant%20CE%20945GM.pdf

Trying another approach, I searched for memory for an AOpen
motherboard that also uses a 945GM and a Pentium M processor.
This is the Kingston product returned for it.

http://www.valueram.com/datasheets/KVR533D2S4_1G.pdf

So I don't think it is the module construction that is
at fault, unless the socket is just not making good contact
with the module.

Paul
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