Q about adding memory to MacPro

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o-maco-mac
Posted:
in Current Mac Hardware edited January 2014
If you add more memory to your MacPro and keep the original memory in the slots but for some reason that memory isn't being read, It looks like tht memory is not compatible with the new memory.

So, will keeping the memory in there mess up the system?

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  • Reply 1 of 8
    royboyroyboy Posts: 458member
    Quote:
    Originally Posted by O-Mac View Post


    If you add more memory to your MacPro and keep the original memory in the slots but for some reason that memory isn't being read, It looks like tht memory is not compatible with the new memory.

    So, will keeping the memory in there mess up the system?



    You need to be more descriptive of what you are trying to relay in your post. Provide specific details.
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  • Reply 2 of 8
    o-maco-mac Posts: 777member
    It originally had 2GB in it.

    Then 8GB (2x4GB chips) was added but for some reason it was only showing 6GB.

    After trying different configurations, the (4) 4GB chips were put in first, then the (2) 1GB chips were added last.

    The machine showed 8GB.

    So it looks like the 1GB chips arent compatible with the 4GB chips.
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  • Reply 3 of 8
    o-maco-mac Posts: 777member
    So, if I leave the original 2GB chips in there, will it slow down the machine? and/or will it cause any future problems?
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  • Reply 4 of 8
    kareliakarelia Posts: 525member
    Is this Mac Pro using DDR2-667, DDR2-800, or DDR3-1066 memory?
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  • Reply 5 of 8
    o-maco-mac Posts: 777member
    Ddr2-800
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  • Reply 6 of 8
    kareliakarelia Posts: 525member
    Then you might have to experiment a little. I've seen both of these configurations work:



    Daughtercard A

    Slot 1: 4GB

    Slot 2: 4GB

    Slot 3: --

    Slot 4: --



    Daughtercard B

    Slot 1: 1GB

    Slot 2: 1GB

    Slot 3: --

    Slot 4: --



    --OR--



    Daughtercard A

    Slot 1: 4GB

    Slot 2: 1GB

    Slot 3: --

    Slot 4: --



    Daughtercard B

    Slot 1: 4GB

    Slot 2: 1GB

    Slot 3: --

    Slot 4: --
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  • Reply 7 of 8
    o-maco-mac Posts: 777member
    How do you know which one is D-card A and D-card B??



    I think I tried that second configuration but it didnt work.

    The difference though is that it's (2) 2GB chips to make 4GB so I had:



    Daughtercard A

    Slot 1: 2GB

    Slot 2: 2GB

    slot 3: 1GB

    Slot 4: --



    Daughtercard B

    Slot 1: 2GB

    Slot 2: 2GB

    slot 3: 1GB

    Slot 4: --



    Maybe this configuration will work?

    Daughtercard A

    Slot 1: 2GB

    Slot 2: 2GB

    slot 3: 2GB

    Slot 4: 2GB



    Daughtercard B

    Slot 1: 1GB

    Slot 2: 1GB

    slot 3: --

    Slot 4: --
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  • Reply 8 of 8
    kareliakarelia Posts: 525member
    Either of those should work. Pretty much anything works, as long as the heavier chips come first on either card.



    Are you sure you've got fully buffered ECC memory?
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