Mixing memory modules in Powermac G5

Discussion in 'Macintosh Computers' started by GreenDice, Nov 5, 2005.

  1. GreenDice macrumors member

    Oct 5, 2005
    If I have both CAS3 and CAS4 RAM modules for the PowerMac, will the computer automatically use the lowest speed for both? They are both DDR2 PC2-4200 533Mhz but the CAS3 memory have faster timing.

    If so, I should replace the factory-installed CAS4 RAM with the faster RAM.

    Thanks in advance.
  2. homerjward macrumors 68030


    May 11, 2004
    fig tree
    don't quote me on this but i don't believe the g5 will run it any faster than CAS4. this was also true of the older g5s which wouldn't run anything faster than CAS3.
  3. Sun Baked macrumors G5

    Sun Baked

    May 19, 2002
    It's not going to make any significant difference what CAS level you choose.

    Having enough memory to avoid the Virtual Memory penalty matters MUCH MORE than having too little of a more expensive memory choice.

    Too little memory, and you will hit the "as fast as a HD" memory speed bump.

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