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Ddr 1 Gb Detected As 512 Mb, How Come?


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#1 novirusplease

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Posted 20 May 2006 - 04:50 PM

I used to run my PC with one DDR memory 1 GB, 400 Mhz on a K7SOM+ (max 266 Mhz FSB) with a Duron CPU.
I installed this memory on another MB (M811, max 266 Mhz FSB, with Duron CPU) which detects it as 512 Mb. How is it possible?

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#2 Snapper

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Posted 20 May 2006 - 05:26 PM

your motherboard wont support either>a.1 gig of ram or B.only 512m per bank.
you can check with the motherboard manufacturer's website to find out if there is another bios version that will enable your board to see a 1gig stick. while you are there, you can verify the memory capacity of that particular board.
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#3 novirusplease

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Posted 21 May 2006 - 03:07 AM

Strange. The manual as well as the website (PCChips) says that this M811 ver 3.1 MB supports up to 1GB for each bank (total 2 GB). The latest official bios dates from Sept 2004 while the version on my PC dates from Nov 2005...
Might it be the cause of this non-detection?

#4 HitSquad

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Posted 21 May 2006 - 06:12 AM

Hi novirusplease.
Take a look in your bios for memory timing adjustments.
It's usually a sub under advanced chipset options or similar.
If you see an SPD option, enable it.
SPD is a chip on the module that contains info about itself.
If the bios mis-reads that info on another setting, it may correct it.
If not, make manual timing adjustments using only the available choices.
Lower is faster in this case.
If it still wont see the full 1gb, something about the module itself is out of the bios's range of operation.
Could be CAS type, ecc vs. non ecc, etc. Don't have that info about the chip your using.
The board only supports DDR266/200 so even if you get the the full 1gb DDR400 recognized, you're not getting full use of it anyway. PCChips boards are well known for being flakey and unreliable too. Putting only recommended memory in it may be all it'll let you do.
Let us know.

Edited by HitSquad, 21 May 2006 - 06:25 AM.


#5 Snapper

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Posted 21 May 2006 - 07:20 AM

while you have your manuel there ,what does it say about your memory? like hitsquad said about different ram, some boards can be picky, the mobo site should list off a few known good working modules.
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