Mac Pro 1,1 - New 4GB dimms registering as 2GB

Discussion in 'Mac Pro' started by MacPoulet, Jun 10, 2013.

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  1. MacPoulet, Jun 10, 2013

    MacPoulet macrumors regular

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    Dec 11, 2012
    #1
    Hi all,

    I just purchased 8GB (2X4GB) for my 1,1 used on eBay. The problem is, they're only registering as 2GB each.

    They're the right type 5300F 667Mhz, and all the labelling says they're 4GB dimms. However, when I put them in my system, the error LED lights up for one of them. I tried moving them around and no matter where it goes, that red LED follows it.

    Is one of the sticks faulty? I haven't done the 2,1 firmware upgrade (long story), but would that help? I wanted to troubleshoot before I contact the seller.

    Thanks so much!
     
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  2. MacPoulet, Jun 10, 2013

    MacPoulet thread starter macrumors regular

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    #2
    Of course the new pro has to come out today...

    Anyone have a suggestion? Anyone?
     
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  3. TheEasterBunny, Jun 11, 2013

    TheEasterBunny macrumors 6502

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    #3
    I'm gonna guess that somewhere in that long ID number those sticks have on them, there is a small part that says "4R" iirc. This is four channel RAM. Old Pro's don't do 4 channel RAM.
    Try to Google that long ID number and see what comes up for it for specs.
    This is just a guess.
     
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  4. MacPoulet, Jun 11, 2013

    MacPoulet thread starter macrumors regular

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    #4
    Thanks, I'll take a look.

    Dang, and I thought I was pretty meticulous about choosing the right kind.
     
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  5. MacPoulet, Jun 11, 2013

    MacPoulet thread starter macrumors regular

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    #5
    The eBay seller listed it as dual channel. I think one of the modules is bad.
     
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  6. TheEasterBunny, Jun 11, 2013

    TheEasterBunny macrumors 6502

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    #6
    Ooo, another good guess:D
    Try hardware test, or some of the free memory testers out there.
     
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  7. 666sheep, Jun 11, 2013

    666sheep macrumors 68040

    666sheep

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    #7
    You're confusing channels with ranks.

    If red LED "follows" the DIMM - yes, it is bad.
     
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  8. MacPoulet, Jun 11, 2013

    MacPoulet thread starter macrumors regular

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    #8
    Yep, the red LED does follow the DIMM, I was able to confirm that today. Contacted the seller and will see what happens. Thanks 666sheep.

    TheEasterBunny: I agree, I think it was a good guess. So good in fact, that's what I'd written in my first post. ;)
     
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