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  1. #1

    Member Since
    Jan 20, 2006
    Not recognising more than 6gb
    I just purchased a new Mac Pro 2 x 2.8 quad xeon, it came with 2 x 1gb ddr2 FB-DIMM 800mhz, i've tried to add an extra 4 x 2gb ddr2 FB-DIMM 800mhz matched pairs in banks 2,3,4

    The memory is recognised in only bank 3, it seems bank 2 and 4 are not working, or am i doing something wrong?

    Thx in advance
    MacBook Pro 17", Core Duo 2 @ 2.4ghz, 2GB, 160GB

  2. #2

    Wilcon's Avatar
    Member Since
    Oct 31, 2007
    Mac Pro Quad Core 2.66, ATI 1900, 5 GB RAM, 750 GB Storage
    I would suggest pulling the factory RAM, installing 2 sets (4 sticks) of the new in the appropriate banks. See what you get then add the next set. Mac Pros work the best when both boards are used so the first 2 matched pairs one should be on each board. Do a search there is a layout recommendation for adding RAM in the best order.
    There are 10 types of people in the world. Those who understand binary and those who don't.

    There are two types of IT problems in the world. PEBKAC and ID 10 T's.

  3. #3

    Member Since
    Dec 24, 2006
    N. Ireland
    Mac Pro 2xQuad core 2.8GHZ
    Yeah its my guess that you got the layout of the banks wrong, its an easy mistake to make.

  4. #4

    mac57's Avatar
    Member Since
    Apr 29, 2006
    St. Somewhere
    iMac 27" 3.4 GHz, 256 GB SSD, 2 TB HDD, 8 GB RAM
    The Mac Pro will "see" at least 8 GB of RAM - that is what I have in mine and it all shows up. Keep working at it, you will get it.
    My Macs: iMac 27" 3.4 GHz, Mac Pro 3.2 GHz, PowerMac G5 Quad 2.5 GHz, G4 Cube with 1.2 GHz Upgrade
    My iStuff: 64GB iPhone 5, 64GB iPad4, 30GB iPod Video, 16GB iPod Touch
    My OS': Mac OS X Lion, Mac OS X Snow Leopard, Mac OS X Tiger, Mac OS 9.2.2, openSUSE 10.3
    I was on the Mac-Forums honor roll for September 2007

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