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Thread: Trouble getting 256mb ram in a 486 Pentium Overdrive

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  1. #1

    Default Trouble getting 256mb ram in a 486 Pentium Overdrive

    Hello everyone, I'm having trouble getting the 4x 64mb sticks to work on my mobo. Component list is:

    Pentium Overdrive CPU (tried an amd 133 x5 aswell)
    Soyo SY-4SAW/2/W5 motherboard
    4 x 64MB EDO SIMM 60ns non parity (tried 2 x 64mb parity 60ns SIMM aswell)

    I also have to 16mb sticks. (not sure which type)
    When I try the 16mb sticks, it will recognise 32mb of ram
    when I try the others, it wont boot.
    but when i combine 2 x 16mb sticks with 2 64mb sticks, it treats the 64mb sticks as 16 mb. (totalling 64mb of ram)
    The manual says the motherboard supports of to 256mb of ram, whats the issue here ?

  2. #2
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    Quote Originally Posted by oronco View Post
    Hello everyone, I'm having trouble getting the 4x 64mb sticks to work on my mobo. Component list is:

    Pentium Overdrive CPU (tried an amd 133 x5 aswell)
    Soyo SY-4SAW/2/W5 motherboard
    4 x 64MB EDO SIMM 60ns non parity (tried 2 x 64mb parity 60ns SIMM aswell)

    I also have to 16mb sticks. (not sure which type)
    When I try the 16mb sticks, it will recognise 32mb of ram
    when I try the others, it wont boot.
    but when i combine 2 x 16mb sticks with 2 64mb sticks, it treats the 64mb sticks as 16 mb. (totalling 64mb of ram)
    The manual says the motherboard supports of to 256mb of ram, whats the issue here ?
    seems like a conflict with the sense lines on the motherboard does it support that much memory?

  3. #3
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    Quote Originally Posted by oronco View Post
    When I try the 16mb sticks, it will recognise 32mb of ram
    when I try the others, it wont boot.
    but when i combine 2 x 16mb sticks with 2 64mb sticks, it treats the 64mb sticks as 16 mb. (totalling 64mb of ram)
    The manual says the motherboard supports of to 256mb of ram, whats the issue here ?
    1) The two 16 mb sticks seem to work so they're probably ok.

    2) Two 64 mb sticks with two 16 mb sticks = 160 mb which is *not* a valid configuration for that board. One 64 mb stick with either one or two 16 mb sticks *is* valid. Check your manual.

    3) The board will accept one 64 mb stick in Bank 0 so you need to try each 64 mb stick one at a time in Bank 0 and see if any work that way. If some work and some don't work that way you probably have some good ones and some bad ones. After you try this test get back to us with your results.
    * If you're looking for DS/DD or DS/HD 3.5" or 5.25" floppy disks, PM me. I've got plenty of new, used and reformatted/overlabled disks for sale. *
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  4. #4

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    If you don't have the manual use this. Also, my past experience always shows that identical modules is the best you can have.

  5. #5

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    Quote Originally Posted by Stone View Post
    1) The two 16 mb sticks seem to work so they're probably ok.

    2) Two 64 mb sticks with two 16 mb sticks = 160 mb which is *not* a valid configuration for that board. One 64 mb stick with either one or two 16 mb sticks *is* valid. Check your manual.

    3) The board will accept one 64 mb stick in Bank 0 so you need to try each 64 mb stick one at a time in Bank 0 and see if any work that way. If some work and some don't work that way you probably have some good ones and some bad ones. After you try this test get back to us with your results.

    One other thing I noticed is that the 2 16mb sticks need to be in bank 2 or 3 to work with the 64mb sticks.

    I did try every stick individually in bank 0 and none of the 64mb stick work alone. The 4 64mb edo sticks are all identical and the 2 x 64mb fpm sticks are identical aswell. Im starting to think I just have a faulty mobo ?

  6. #6
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    Are your 64mb sticks x32 or x36? I did up several Soyo mobos back in the day, mostly AMD to start with, but had several issues where putting in max ram required specific chips. Even though it says it will take x32, it may be a problem with the 64meggers not being x36. I know there are logical arguments against this, but I know what I saw back in the day. Also try a lone 64m in each bank by itself and see what you get. Also was it the parity or non-parity that did recognize as a 16m?

  7. #7

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    Quote Originally Posted by dracos View Post
    Are your 64mb sticks x32 or x36? I did up several Soyo mobos back in the day, mostly AMD to start with, but had several issues where putting in max ram required specific chips. Even though it says it will take x32, it may be a problem with the 64meggers not being x36. I know there are logical arguments against this, but I know what I saw back in the day. Also try a lone 64m in each bank by itself and see what you get. Also was it the parity or non-parity that did recognize as a 16m?
    The set of 2 is 32 and the set of 4 is 36 or visa versa. Both parity and non Parity work as 16meg.

  8. #8
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    Quote Originally Posted by oronco View Post
    I did try every stick individually in bank 0 and none of the 64mb stick work alone. The 4 64mb edo sticks are all identical and the 2 x 64mb fpm sticks are identical aswell. Im starting to think I just have a faulty mobo ?
    Even though it doesn't seem likely it could be faulty memory. Do you have someplace else to test the memory?
    * If you're looking for DS/DD or DS/HD 3.5" or 5.25" floppy disks, PM me. I've got plenty of new, used and reformatted/overlabled disks for sale. *
    * There is a crack in everything; that's how the light gets in. -- Leonard Cohen *
    * Time flies like an arrow; fruit flies like a banana. *

  9. #9
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    Hi Oronco,

    Sorry to hear that you're having such a hard time with your Soyo. The following is a link for the manual: http://www.elhvb.com/mobokive/Archiv...w/4sw-mu20.pdf

    According to the manual you are free in install the sticks in any slot that you wish. Make sure you at least have 72-pin 80 ns RAM as per the manual. Also, I'm not a big proponent of the Pentium Overdrive (I have it, have run it & don't like the performance). With a your board you'll want the the 133 which you can easily oc to 150 or more.

  10. #10

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    Quote Originally Posted by Stone View Post
    Even though it doesn't seem likely it could be faulty memory. Do you have someplace else to test the memory?
    Yeah the memory works fine, i tested it on a asus hx socket 7 mobo

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