Follow: Expanding my RAM

August 13, 2009 at 03:31:10
Specs: Windows XP

I hope you see this. I finally got around to upgrading my RAM.

(reference question from 6/28/2009, Hardware category, subcategory: RAM, titled Expanding my RAM. I tried responding to it but no response)

Here is what happened:

First, I opened my computer to check it out. Inside there were 2 slots and the original 2 256 MB, PC2100 cards. (also Under the my computer, system info it showed 504MB)

So, I closed it up and went to order my memory.

Second, I ordered the memory. I made the mistake of ordering the wrong type. Your message above said PC2700 but I messed up and ordered 2 512MB PC2100.

Well they came and I did not catch the mistake till now. Since the old 256 cards were PC2100, I decided to try the 2 new 512MB PC2100.

Well, they are in there and working (I am typing this on that computer)

Here is my problem:

When I go to the My Computer and check system information, is still only showing that I have 504 of RAM

I verified that both cards are in the slots properly.

Help what do I do? I am confused. Not sure why my system is even working. But since it is working it is recognizing something from the 2 new cards, but not the full 1G of Ram.

See More: Follow: Expanding my RAM

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August 13, 2009 at 04:50:36
I have no idea which post you are referring to. Post your system specs. I suspect that your motherboard memory controllers can't use more than 256MB modules.

Or the 512MB memory modules may be of too high a density and the controller can't fully handle them. It is common when that happens that only half will be recognized.

So, you bought the RAM too long ago to now return it?

You can go to and use their online scan to determine the proper memory.

I assume you realize your integrated graphics is using the other 8MB?

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August 13, 2009 at 05:38:44
how much ram does the bios report? Where did you buy it from?


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August 13, 2009 at 05:56:14 - use the Memory Scanner to dertermine wether or not your motherboard is compatable with 2 x 512MB, also you forgot to mention wether you bought single-sided or double-sided memory, I will presume CAS 2.5 though.....

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Related Solutions

August 13, 2009 at 07:14:06
Othehill - below is link to the OP original post.

mike5885 - DON'T DUPLICATE POST! Stay with your original thread above.


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August 13, 2009 at 13:21:41
Is there anyway for me to link to the old post, it has all of the info and questions that we went through?

here is the link to it, not sure if it will work, hope it helps

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August 13, 2009 at 13:28:00
You already have the answer to your problem. You bought incompatible RAM.

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August 13, 2009 at 14:24:00
so do you think that if I return the PC2100 for the PC2700 512's, that the 2700's will work?

follow up, just for me benefit, why did the PC2100's work at all when I put them in? plus why are there PC2100's 256K in there originally

I appreciate your time and help,


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August 13, 2009 at 15:47:22
The fact the PC2100 isn't working is probably because of the chip density or the number of banks is too high.

The PC2700 should automatically be configured to run at the correct speed. If that RAM has chips on it with too high a density or too many banks then it won't work either.

An analogy would be if you went to the auto parts store and bought spark plugs based strictly on the fact the plugs were the correct size to screw in. That doesn't mean they will work correctly.

Try the PC2700. If the full capacity doesn't show then post all the information on one of the black chips and on any white label on the stick.

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August 13, 2009 at 22:56:16
will do

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August 20, 2009 at 14:33:30
Thank you for all of the help.

The old RAM is returned and the new memory is installed and working.

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