Mac Pro Memory Upgrade

Discussion in 'Mac Pro' started by rendimage, Mar 3, 2008.

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  1. rendimage, Mar 3, 2008

    rendimage macrumors newbie

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    Mar 3, 2008
    #1
    I have recently purchased 8gb of 800mhz ram for my mac pro. The mac pro is about 5 months old. I took out the 667mhz ram completely. In the About this mac displays that the ram is running at 667mhz and not 800. I assumed that if I removed all traces of the slower ram the bios would recognize the faster ram. Is the ram really running at the faster speed or have I just payed extra for not good reason?

    any help would be most appreciated.
     
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  2. aaronw1986, Mar 3, 2008

    aaronw1986 macrumors 68030

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    #2
    If your Mac Pro is about 5 months old, then it is the older model. Only the new model released in 2008 supports 800Mhz RAM
     
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  3. CanadaRAM, Mar 3, 2008

    CanadaRAM macrumors G5

    CanadaRAM

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  4. bigbird, Mar 3, 2008

    bigbird macrumors 6502

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    #4
    As the old knight said in Indiana Jones and the Search for the Holy Grail:
    "You have not chosen wisely". There is and won't be anything to be gained by using 800MHz FB-DIMM's in the original Mac Pro. The RAM can only run at 667MHz. Either buy a new MP, or sell the 800MHz RAM.
     
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  5. SDDave2007, Mar 3, 2008

    SDDave2007 macrumors regular

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    #5
    You just paid a premium price for nothing...

    Unless you have the latest MacPro....

    The latest MacPro uses the 800Mhz chips

    The earlier MacPros use 667Mhz chips, and will go no faster....
     
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  6. rendimage, Mar 3, 2008

    rendimage thread starter macrumors newbie

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    Mar 3, 2008
    #6
    thanks guys. oh well. I guess I need to buy a new machine!!! Is there any reason to use more than 8gb. I mean is there any noticeable difference in putting in 12 or 16gb? I run cs3, model and render in cinema 4d and before I was getting out of memory errors with only 4gb.

    cheers
     
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  7. jb60606, Mar 3, 2008

    jb60606 macrumors 6502a

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    #7
    I was just about to say; don't downgrade your RAM. Upgrade your PC. That's the Mac way. :D

    In all seriousness, unless it's the uber expensive Apple branded RAM, don't return it. It'll still run at 667Mhz, and may possibly be utilized in future MPs (though doubtful).
     
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  8. IgnatiusTheKing, Mar 6, 2008

    IgnatiusTheKing macrumors 68040

    IgnatiusTheKing

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    #8
    If I buy a Mac Pro that has 1GB (1 x 512MB) RAM and I buy 4GB (2 x 2GB), should I install the new stuff in slots 1 and 2 and take the original 1GB out completely, move it down to different slots and have 6GB RAM, or install the new stuff in the next slots down and have 6 GB?
     
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