Disappearing Memory 2->1.5 then 8->6

Discussion in 'Mac Pro' started by davethelorax, Oct 21, 2009.

  1. davethelorax macrumors newbie

    Oct 21, 2009
    I noticed about 2 weeks ago that my Mac Pro (early 2008) was reporting 1.5 GB instead of the 2 GB that I was sure it had. That made me angry :mad: (at myself mostly for not noticing earlier), but I had planned on buying more memory anyway so I went ahead and bought 8 GB (2 x 4GB) and replaced the two DIMMs in the computer. All seemed well until I started getting correctable ECC errors on one of the DIMMs. I reported this to the manufacturer and they suggested zapping the PRAM which I did. Now, my computer lovingly reports that it has 6 GB of RAM instead of 8 GB.

    Oddly enough, this is the same pattern as before. One of the DIMMs is showing as a 2 GB rather than as a 4 GB DIMM. The computer runs fine but reports 6 GB of RAM. This is weird. Any clues?

    --- Thanx
  2. UltraNEO* macrumors 601


    Jun 16, 2007
    They shuffling the modules about.. and occasionally dust in the sockets can cause them to vanish, due to connection problems I suspect.. I have the same problems from time to time... Regular house keeping helps a lot!

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