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Memory: Questions.....questions....questions....

Discussion in 'Hardware' started by jlee4751, Apr 24, 2001.

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  1. jlee4751

    jlee4751 Thread Starter

    Joined:
    Sep 7, 1999
    Messages:
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    I have a Packard Bell P133, model D135. Eight megs of
    RAM are on the motherboard. According to a search of
    this model on a 'Memory' website, this model has FPM non-
    parity memory. The machine had two 4-MB modules installed
    when it was new in 1996, for a total of 16 MB at time of purchase.
    Since then, I have added two 8MB modules to bring it up to
    32MB. Two weeks ago, I replaced the two 4MB modules with
    two 32MB FPM modules, which was supposed to bring it up to a total of 88MB. When I boot up, it only reads slightly over 81MB as passed....of course, on the System Properties 'General' tab, 80MB is listed. Can anyone tell me what might have happened to the other 8MB?

    Another question: Would parity memory be compatible with
    non-parity memory? I know from research, that most servers use parity memory...parity being described as a feature of
    a module for error-checking. Would parity memory work OK with non-parity, but not the other way around? The reason I ask is, I have an opportunity to buy some used 72-pin, FMP parity modules at a good price, and I just wanted to know if the two (parity and non-parity) would mesh. I wanted to bring it up to the max for this model....136MB, providing the 8MB on-board memory is read. That was my own theory about the missing 8MB....that the on-board memory, for some reason isn't being read. Any thoughts on this?

    Last questions: How critical is mixing speeds? Will 70ns
    modules in one bank work with 60ns modules in another bank, or vice-versa? Will different speeds work together in the same bank, or do the modules have to have absolutely identical specifications between banks and within banks?

    I know these are a lot of questions, but I would appreciate any help on this. I've gotten good advice from this forum in the past, and I know if anyone knows the answers, you guys do. Many thanks.

    Jack Lee
     
  2. brianF

    brianF

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  3. ~Candy~

    ~Candy~ Retired Administrator

    Joined:
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    Nevermind......

    [Edited by AcaCandy on 04-24-2001 at 08:00 PM]
     
  4. jlee4751

    jlee4751 Thread Starter

    Joined:
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    Messages:
    119
    Thanks for the website, Brian. It answered the question
    about the speed. But how about mixing parity and
    non-parity modules? Also, do you have any ideas about the
    missing 8MB of RAM? Let me add that now there is something
    else that baffles me....I took out the two 8MB modules and
    replaced them with the two original 4MB modules that came
    with the computer, and guess what?? Now when I boot up it
    reads over 90MB passed (88MB on the system properties tab).
    Now somehow, I have 8 extra megabytes of memory and I have
    no idea where it comes from.

    two 32MB modules = 64MB
    two 4MB modules = 8MB
    on-board 8MB = 8MB
    ----
    Total............80MB

    Any ideas? Am I missing something basic? Help!!
    Another thing: Am I correct in putting the two 32MB modules
    in the first bank? Is the 8MB on-board read before the
    modules in the banks, or vice versa? I'm assuming that the
    first bank is read before the second bank...right? Again,
    questions.....questions....questions...
     
  5. brianF

    brianF

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    Maybe you should have finished what you where going to say Candy :)

    Personally I wouldn't mix the ram, not sure if it would work or not with it mixed. It does say this
    which leads me to beleive it would work.
     
  6. jlee4751

    jlee4751 Thread Starter

    Joined:
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    Messages:
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    Thanks once again, but can anyone shed some light on the
    missing RAM/extra RAM questions?
     
  7. jlee4751

    jlee4751 Thread Starter

    Joined:
    Sep 7, 1999
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    Sorry about the two back-to-back posts, but for some reason
    I wasn't allowed to use the 'edit' function.

    What about the correct placing of the modules in the banks?
    Should the larger modules go in the first bank? Which is
    read first...the first bank, the second bank, the on-board
    memory?
     
  8. ETS

    ETS

    Joined:
    Oct 13, 1999
    Messages:
    972
    Hi jlee4571,

    I think I have your missing ram mystery figured out.
    I read through your posts very carefully and even drew a diagram tracing the steps you took adding and removing ram.
    Everything makes perfect sense if you go back to the step where you removed the 4meg modules and replaced them with 32megs to bring the total up to 88. I think you must have forgotten which were the 8 and which were 4 and removed the 8s by mistake. If you accept that possibility, everything adds up!
     
  9. jlee4751

    jlee4751 Thread Starter

    Joined:
    Sep 7, 1999
    Messages:
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    Thanks for replying, ETS, but no...I know for sure
    which are the 4's and which are the 8's. The 4's have
    eight chips vertically positioned on each side and the
    8's each have two larger horizontal chips on one side only.
    When I bought the 8's, the computer had 16MB on boot-up.
    After installing them 32MB was read, so I'm sure they're
    8's. Any other theories would be appreciated, though.
    Again, thanks.
     
  10. ETS

    ETS

    Joined:
    Oct 13, 1999
    Messages:
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    Well, leave it to a computer to make a fool out of me. I thought sure that was it. The only other thing I can say on the matter is I recognize those memory module styles that you describe and have had trouble in the past getting them to work together, even in separate banks.
     
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