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  1. #1

    Member Since
    Jun 06, 2008
    how can i know i'm buying the right memory kit?
    hi there.
    i just got a Mac Pro Quad-Core Intel Xeon dual 2.8 GHz with 2GB of memory.

    i found an 8GB ( 2 x 4GB ) DDR2 PC2-5300 ECC Fully Buffered Memory Kit for
    Apple Mac Pro Quad & 8-Core online for about $700

    i've also found DDR2 PC2-6400 for about $50 more.

    how can i be sure i'm buying the right memory for my computer.
    they seem to be very model-specific.

    do these prices sound reasonable?
    i'd rather buy the 4GB chips to have more room to expand in the future.

    i appreciate your help.


  2. #2

    Member Since
    Aug 04, 2007
    The System Profiler utility will tell you whats already inside your mac so at least you can compare the memory types.

  3. #3

    mrplow's Avatar
    Member Since
    Oct 01, 2007
    27" iMac i7 (2011) 10.11, Mac Mini i5 (2014), iPhone6s, Apple Watch, iPad Air 2, New AppleTV (4?)
    The Crucial Website has a system profiler that will guarantee to find compatible ram

  4. #4

    bryphotoguy's Avatar
    Member Since
    Feb 02, 2007
    Chicago, IL
    Quad 2.8GHz Mac Pro, Edge iPhone
    You need the PC6400 RAM. The PC5300 is for the older Mac Pros. Try I suspect their prices are much more reasonable and they clearly state which speed is for which model.

    January 2008 Member of the Month

  5. #5

    mac57's Avatar
    Member Since
    Apr 29, 2006
    St. Somewhere
    iMac 27" 3.4 GHz, 256 GB SSD, 2 TB HDD, 8 GB RAM
    Per mrplow, the Crucial Web Site has a "Memory Advisor" that will lead you to the right memory. In this case, you want the Mac Pro, Xeon 5400 4 core type, which leads you to this page. From this you can see that what you want is DDR2-6400.

    I have the same generation of Mac Pro and bought memory upgrades from Crucial. They work great, so I can confirm that this is the right memory for the machine.
    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

  6. #6

    Member Since
    Jun 06, 2008
    many thanks.
    it was $50 cheaper at so it's on its way now.
    bought 500GB drive to boot.
    can't wait.

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