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Memory problem.

  • 16-02-2006 7:51pm
    #1
    shayser
    Closed Accounts Posts: 1,650 ✭✭✭


    I've a PIII 600Mhz. The BIOS is only seeing half the installed memory. I've tried a 512mb PC100 DIMM, BIOS reports only 256. Tried a 256 PC133 and the BIOS only reports 128. Would there be something I need to change is the BIOS? Any other ideas?...


Comments

  • #2
    Ruu_Old
    Closed Accounts Posts: 36,634 ✭✭✭✭Ruu_Old


    erm i think it has something to do with the jumpers on your motherboard that you have to switch. I think they are near the memory modules


  • #3
    mp3guy
    Registered Users, Registered Users 2 Posts: 3,977 ✭✭✭mp3guy


    Might only support 256


  • #4
    christophicus
    Registered Users, Registered Users 2 Posts: 3,969 ✭✭✭christophicus


    Yeah but why would it then show the 256 module as 128?


  • #5
    shayser
    Closed Accounts Posts: 1,650 ✭✭✭shayser


    Ruu wrote:
    erm i think it has something to do with the jumpers on your motherboard that you have to switch. I think they are near the memory modules

    Can't see any jumpers near the memory slots. What might they be labelled as if they're somewhere else on the board?


    I put in 2x512 and this comes up as only 512.


  • #6
    HSo
    Closed Accounts Posts: 68 ✭✭HSo


    Your machine may only accept only single-banked memory. If you have installed dual-banked, the computer will read only half the memory on the module.


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  • #7
    shayser
    Closed Accounts Posts: 1,650 ✭✭✭shayser


    HSo wrote:
    Your machine may only accept only single-banked memory. If you have installed dual-banked, the computer will read only half the memory on the module.
    Is single-banked where the memory is on one side of the stick only? The 256 that I have is like this... but is only coming up as 128...


  • #8
    HSo
    Closed Accounts Posts: 68 ✭✭HSo


    Yeah single bank is one side only.

    That's strange problem. If there are no jumpers, there maybe settings in the BIOS or the BIOS may need updating.

    Another thing I was thinking, it maybe that the mainboard can only handle a certain capacity on each slot. Mind you it depends on old the board is and it would want to be pretty old not to ID 512DIMMS in each slot.


  • #9
    shayser
    Closed Accounts Posts: 1,650 ✭✭✭shayser


    I've just put in a 128 and it's coming up correct :confused:


  • #10
    HSo
    Closed Accounts Posts: 68 ✭✭HSo


    what is the make and model of the mainboard?


  • #11
    shayser
    Closed Accounts Posts: 1,650 ✭✭✭shayser


    HSo wrote:
    what is the make and model of the mainboard?
    It's a Chaintech 6BTM0


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  • #12
    HSo
    Closed Accounts Posts: 68 ✭✭HSo


    It looks like bad news on the 512 DIMMS and on the 256 for that matter.

    It seems that this board has four slots each of which can only support 128 DIMMS.

    Check out the following link for the board manual:

    http://www.chaintech.com.tw:8008/support/manuals.htm

    Edit = Are you sure you have the right model number?


  • #13
    shayser
    Closed Accounts Posts: 1,650 ✭✭✭shayser


    HSo wrote:
    It looks like bad news on the 512 DIMMS and on the 256 for that matter.

    It seems that this board has four slots each of which can only support 128 DIMMS.

    Check out the following link for the board manual:

    http://www.chaintech.com.tw:8008/support/manuals.htm

    Edit = Are you sure you have the right model number?

    Was just at the chaintech site.. thanks for the direct link :) Strange how it will take the bigger DIMMS but only use half :confused:

    On first glance at the manual, it says ECC compatability (not that I know what that means) but I noticed the bios is set to non ecc... would changing that make any difference

    Yeah, that's the board alright... from the manual.


  • #14
    shayser
    Closed Accounts Posts: 1,650 ✭✭✭shayser


    Put in 4x128 and got the 512. Will leave it at that. Thanks for the time and help HSo.


  • #15
    HSo
    Closed Accounts Posts: 68 ✭✭HSo


    To be honest I'm not sure about the ECC, you could try setting it. Some DIMMS come with extra chips for error correction and some boards insist on it being enabled.

    See if you can get an update for the BIOS from the Chaintech site. This can solve those kinds of problems on occasion, where a board's spec to handle different CPUs and mem can be changed.

    The reason I asked about the model number is that the manual specifies a much lower CPU than what you quoted earlier.

    The physical size of a DIMM makes no difference, if I have understood your comment correctly about the board taking the larger DIMM.

    I have seen machines reject memory simply because it didn't like a particular model, Dell machines are very particular for example.


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