PowerMac G5 Quad Underclocking RAM?

Discussion in 'PowerPC Macs' started by tayloralmond, Feb 24, 2012.

  1. tayloralmond macrumors 6502

    Mar 26, 2009
    Michigan, USA
    Hello all,

    I installed some 2GB DDR2 667MHz sticks of RAM in my PowerMac and for some reason, it's showing up as DDR2-400MHz RAM...any ideas why it's doing this? I'm aware that it shouldn't show up at full speed because the G5 Quad can only reach 533MHz RAM speeds, but I don't understand why it would possibly under-clock all the way to 400MHz. I've tried installing in different slots as well and that didn't help. Thanks for the help everyone.

    (link to the RAM I'm referring to)


    Attached Files:

  2. MrCheeto macrumors 68030


    Nov 2, 2008
    It would also throttle the RAM down to the slowest module's speed.

    If you have one single module that's slower, all of the others will be throttled to match.

    Try removing one stick of RAM and check it then. Shut it down, put the stick back in and remove another and repeat until you've removed each at least once.

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