RAM set up issues?

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chikarachikara
Posted:
in Genius Bar edited January 2014
I keep hearing occasionally about ram having to be installed "in pairs"



I have 256 stock and just bought a 512 from new egg(crucial ram).



Will it work properly or would I have to drop the 256 and go straight for 1G?



someone told me having the 768 won't function properly.

Comments

  • Reply 1 of 6
    steve666steve666 Posts: 2,600member
    Quote:

    Originally posted by Chikara

    I keep hearing occasionally about ram having to be installed "in pairs"



    I have 256 stock and just bought a 512 from new egg(crucial ram).



    Will it work properly or would I have to drop the 256 and go straight for 1G?



    someone told me having the 768 won't function properly.



    SDRAM doesnt have to be installed in pairs. Neither does DDR.

    Only older RAM needs it.



    Newegg sells crucial RAM? I thought only Crucial sold their own RAM. Id Newegg cheaper than Crucial's website?
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  • Reply 2 of 6
    chikarachikara Posts: 116member
    $78 for a new 512mb DDR pc2700.



    Yet, my manual for my G5 confirmed that "all DIMM"s should be installed in pairs in the adjacent slots" or something like that. Why does apple say that?
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  • Reply 3 of 6
    steve666steve666 Posts: 2,600member
    Quote:

    Originally posted by Chikara

    $78 for a new 512mb DDR pc2700.



    Yet, my manual for my G5 confirmed that "all DIMM"s should be installed in pairs in the adjacent slots" or something like that. Why does apple say that?



    Ahhh The G5 may have seperate RAM issues.

    I think Ive heard before that G5's do need to be installed in pairs.

    Anyone here with a G5 want to help out?
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  • Reply 4 of 6
    oldcodger73oldcodger73 Posts: 707member
    <<$78 for a new 512mb DDR pc2700.



    Yet, my manual for my G5 confirmed that "all DIMM"s should be installed in pairs in the adjacent slots" or something like that. Why does apple say that?>>



    Chikara people can answer your questions more accurately if you provide information about your computer. I'm assuming you have a PM G5. If so your manual is correct, memory must be added in pairs of the same size. Furthermore all second generation PM G5s require DDR PC3200 chips as do some of the first generation ones.
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  • Reply 5 of 6
    chikarachikara Posts: 116member
    my computer is a 1.6ghz first gen G5 with 4 dimm slots.



    currently two are occupied with the stock 128s.
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  • Reply 6 of 6
    karl kuehnkarl kuehn Posts: 756member
    The Powermac G5's require paired memory for the same reason that "older computers" required it: by interleaving them (using two sticks at the same time) you can get almost twice as much information out of them at a given time. memory speeds simply have not kept up with processor speed, so this is often necessary.
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