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How do I determine what kind of memory that I need?

I need to know how to determine what kind of memory to buy.

How do I determine whether to use high density or low density memory?

What is the advantage to low density memory?

Are external bus speed, FBS, and/or memory speed the same?

I ask because my laptop external bus speed is 400 MHz but the memory calls for either 200 or 266 MHz memory but I don’t know if they are talking about high or low density memory.

Thank you for your help.

Don Jones

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  • donejjones Dec 30, 2008


    Your guesses contradict everything I have read about high and low density memory, so I need answers to the questions I asked, not guesses.

    All of the manuals say my Inspiron 2650 will only use 256 modules, but the DELL techs put 1 gig modules in their test machine and it worked great. I also know it uses the same Intel chip set as the 8500 which uses 1 gig modules and the Intel manual says it will use 1 gig so you can’t always believe what the manual says.

    Thanks for trying though.

    Don Jones

  • donejjones Dec 30, 2008


    Thanks for the suggestion, but if you read my comment to Knotbeerdan, you will see that I already know that the motherboard will support 1 gig modules, both by talking to DELL techs and experience as well as refering to the Intel mnaual for the chip set. When I ran crucial's scan, it parroted the DELL mnaual exactly, even though DELL uses the same chip set in the 8500 and uses 1 gig chips the 8500 module.

    Now you know that Crucial's scan isn't necessrily right about the maximum memory that will work but gives a SAFE max based on the manufacturer's literature.

    Also, I know from installing my son's memory that it will use memory that is faster than crucil says it will use.

  • donejjones Dec 30, 2008


    Don't blame me because you tried to answer quesions that I didn't ask but instead tried to second guess what I really wanted to know and guesed wrong. Next time READ the questions and reply to the questions asked or ask for clarification before answering. You childish rsponse just got yu another inappropriate rating so just keep on lashing out because you messed up.

  • donejjones Dec 31, 2008

    I only rated your responses one time each to the best of my knowledge. In fact I am not sure that I even rated your second response like I said I was going to do.

    If the managemnet has any question they can feel free to contact me to try to straighten it out. At the most there shuld have only been 2 ratings and if you hadn't lashed out at me in your second comment there would have only been 1. I can understand youranger at getting 20 bad ratings, but once again, you need to understand what you are responding to and not second guess and dhten go off on a tangent withot verifying your assumption.

    I consider your answers to have been dealt with and have NO desire to screw with your ratings by putting 20 inappropriates in nor do I even know how to do it.

    This is only the second post I have made and I could NOT find any choice that said that your response was off target or unresponsive so I rated the first one INAPPROPRIATE because it wasn't appropriate to the questions asked. I am sorry if the system glitched and put in a whole bunch of INAPPROPRIATEs.

  • Anonymous Apr 06, 2009

    my motherboard is Time ms-7095(p4mam2-v) I asked crucial to do a scan and they advised me to get 2 x 1gb memory cards, I have bought these but am only getting a total of 990 mb. Is this to do with high and low density ? Can you help me with what I should ask for to get 2gb total.




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In order to know what kind of memory you need you will have to look up the model of the computer and hopefully that is it. High density is manufacturer specific and it is very important if you order hi density for the wrong brand it wont work. My educated guess is you will want low density 266mhz and depending on how new you might only be able to upgrade 256 mb per stick I hope this helps i know its a confusing subject but really you just need to get online and start researching ram before you make any decisions.

Posted on Dec 30, 2008

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  • Dan rogers
    Dan rogers Dec 30, 2008

    I do not have one of these systems available to me so the best i can do is go online and research this stuff. And on top of that take educated guesses. I don't appreciate the ranking however. It took time and thought and although some facts may be incorrect but that is based off the info given if you want better feedback provide more info. The last bit would have been really helpful before. Now i have to spend a WHOLE lot of time trying to repair my rating thanks for using fixya

  • Dan rogers
    Dan rogers Dec 31, 2008

    i would like to know how you added over twenty innapropriate ratings. Though it seems you already knew the answer and apparently neither of us that tried to help could understand what you were wanting. And all i was sayin is to please not be so fast to rate people as Inappropriate. We work hard to try to help people out. For free, this is not a site that people need to pay for so keeping that in mind sometimes we need people to bear with us while we try to figure out the real question. But again, I would like to know how you added so many Inappropriate ratings?

  • Dan rogers
    Dan rogers Dec 31, 2008

    dont feel bad just wonderin if you had found somethin that i should look out for in the future

  • Dan rogers
    Dan rogers Dec 31, 2008

    I would like to take a second to thank you, Like i said it was not necessary to remove the rating. But thank you anyway.


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Go to and install their configuration utility through your browser. They will tell you what you have and all the combinations you can do to max out your system. Look at the specs of the RAM and you can get it from Crucial or some other vendor.

Posted on Dec 30, 2008


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1Instructions Things You'll Need:
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  1. Step 1 Check the owner's manual or motherboard manual to determine if RAM is parity or non-parity. The website of the company you purchased the computer from usually will tell you what kind of memory your computer needs as well.
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