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Can I mix 2RX8 and 2RX16 memory sticks on same computer?

Posted on 2009-12-30
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I have installed 2 memory sticks on my laptop of 1GB each, but it just see 1 GB.

One stick is 2RX8 and the other one is 2Rx16. Can I mix them ?

1GB 2RX8 PC2-5300s-555-12-E0 1GB DDR2-667-CL5

1GB 2RX16 PC2-5300s-555-13AO 1GB ddr2 667 CL5 A
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Question by:giangabriel
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silemone earned 2000 total points
ID: 26148389
from the history, you  shouldn't mix x2 with X4
and X4 with X8

so i'll assume that trend continue that you shouldn't mix and match

http://www.kingston.com/ukroot/serverzone/pdf_files/Mem_ranks_ENG.pdf
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by:silemone
ID: 26148464
maybe though you should try because i came across this on a forum and it seems that there was a configuration that had just what you're speaking of:

see link: search and fine 'RAM compatability'

snippet:


 RAM compatability
Paul posted on Wednesday, June 13, 2007 12:02 AM

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.

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by:silemone
ID: 26148474
to cypher through the paragraph  i'm referring to this portion:

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.

link to article:
http://www.eggheadcafe.com/software/aspnet/30141878/ram-compatability.aspx
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