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Full RAM not being recognized

I have two memory slots in my Sony Vaio laptop, one of which came with 256 MB installed. Almost 6 months ago, I put in another 512 MB (DDR266 SODIMM).

I noticed this week that the RAM being reported is 640 MB, not 768 MB as it should. The total amount possible is 1 GB. Using the RAM configuration detection utilities from memoryx, I found out that the two banks are being reported as 512 and 128.

Before adding the 512, my computer used to report 256 just fine. That 256 MB is the one shipped with the laptop so I wouldn't think there are any compatibility issues with it. So I'm not sure why it is not recognizing it in full now. It's being reported as a total of 640 MB in the BIOS too (not just Windows XP).

I cannot say for sure that it was recognized as 768 MB ever but I think it was. I don't believe I've done any BIOS upgrades. To make sure that I hadn't done any upgrades which caused part of the RAM not to be recognized, I checked the upgrade version of BIOS offered on the Sony site, and found that mine is not one of those upgrades.

Any ideas on what I could try?

Thanks,

G.


Computer Make:       Sony Corporation
Computer Model:       PCG-FR720(I)
Computer Version:       01
Motherboard Model:       Q51-Project
Motherboard Version:       01
CPU:       AMD Mobile Athlon XP 1.66Ghz
Installed Memory:       2 slots: 128 MB, 512 MB
Matched - Machine:       VAIO PCG-FR720
Matched - Model:       http://www.memoryx.net/sovapcme297.html
ECC:       No



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gopiku
Asked:
gopiku
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3 Solutions
 
Irwin SantosComputer Integration SpecialistCommented:
If you change the positions of the RAM modules, do you get the same results or do they correctly report 768?

outside of that, it could be the 256 module is either failing or your BIOS on your system is NOT functioning correctly.

If that is the case, attempt a BIOS flash (update with the latest firmware), consider replacing that 256 module, or contact Sony for repair.
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MarkCommented:
If you look closely at the memory page link you posted , your laptop isn't supported for this memory. Here is the abbrieviated list showing the FR series that is compatible
FR33, FR33/B, FR55, FR55G, FR55G/B, FR55J, FR55J/B, FR55R, FR77G/B, FR77J/B, FR102, FR130, FR315B, FR315E, FR315M, FR315S, FR395EP, FR415B, FR415S, FR495EP, FR700, FR820, FR820L, FR820S, FR825CP, FR825P, FR825SP, FR860, FR862, FR870, FR872, FRV23, FRV31, FRV33, FRV34, FRV35, FRV35Q, FRV37
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MarkCommented:
As a matter of fact niether crucial or kingston have your model of laptop in their database either.
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MarkCommented:
Check this link explaining that this model , Sony VAIO PCG-FR720 only supports modules made with a specific type of chip.
http://www.4allmemory.com/index.cfm?fuseaction=search.memorySearch&model_id=39136&memory_id=103392
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Irwin SantosComputer Integration SpecialistCommented:
I concure with sparkmaker, and my comment was based on the assumption that you have purchased compatible RAM.  The fact that it report correct memory  the first time, and not now, is one of the results if non-conformance.
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gopikuAuthor Commented:
I haven't tried swapping the modules, I will do that.

I didn't put in the memory from memoryx.com - I just used their utility for diagnostic purposes. I have purchased compatible RAM - which is working fine. It's the old module which isn't being recognized in full.

Info on 720 is harder to come by as it a model for the Asia Pacific region. So it won't be listed in a lot of documentation meant for the American market.
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nobusCommented:
could be that different ram  are not mixing well together; maybe double density versus single density ?
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Gary CaseRetiredCommented:
It's certainly unusual that the original module is the one being mis-reported here.

A couple of questions:

(1)  What is reported if you remove the newer module and boot with only the original memory?

(2)  What is reported if you remove the original module and boot with only the newer memory?

(3)  For each of the sticks, are they single-rank or dual-rank ? (chips on one side or both)




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gopikuAuthor Commented:
Swapping the two modules fixed the problem! Thanks! I appreciate the replies.
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Irwin SantosComputer Integration SpecialistCommented:
cool. thank you!
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