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  1. #1
    Lucky_Penguin
    Guest
    Weird RAM Problems with my Dual G5??!!
    Hello Hello
    Well I recently bought a dual G5 and I just purchased the base model Dual
    2GHZ that came with 512mb (2x256mb) of ram. Anyhow I recently purchased some Corsair Valu Select ram from Newegg which came in a 2x 512mb package.
    So I installed them and my G5 says that I only have 1GB of Ram instead
    of the 1.5 GB that I should have. I looked in the system profiler and it
    says this in the memory section
    DIMM0 - 256 MB DDR SDRAM
    DIMM1 - 256 MB DDR SDRAM
    DIMM2 - 256 MB DDR SDRAM
    DIMM3 - 256 MB DDR SDRAM

    I installed the 2 512mb sticks on DIMM 0 and DIMM 1.
    But for some reason they are registering only 256mb.
    Now I checked the box and it says they are 512mb each, i check
    the label on the sticks and they say 512mb each and I also check
    to make sure that it had the 8 32mb chips on each side of each stick
    to maked 512mb on each stick.

    Now, i also tried to have JUST the 2 Corsair 512mb sticks in the system without
    the factory 256mb sticks and it did not even want to boot up.
    Then I tried just the 2 Corsair 512mb sticks with one of the 256mb factory
    sticks and it booted up but said I only had 512mb installed.
    Its almost like if I dont have at least one of the 256mb factory sticks in there
    it does not even want to boot up.

    Here is the ram I got on newegg
    http://www.newegg.com/Product/Produ...N82E16820145440

    There is even reviews from people who have used it in their G5s and it worked.
    Maybe im doing something wrong, someone please give me some advice.
    Thanks

  2. #2
    Weird RAM Problems with my Dual G5??!!

    Member Since
    Jul 22, 2003
    Location
    Hamilton College
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    6,999
    Specs:
    20" iMac C2D 2.16ghz, 13" MacBook 2.0ghz, 60gb iPod vid, 1gb nano
    You need to have similar RAM types in each slot i.e. 4 512's, 2 256's, 4 1gbs

    You can't mix and match
    Don't forget to use the new User Reputation System

  3. #3
    Lucky_Penguin
    Guest
    Yea but even if I took out the 2 256mb sticks it still wont boot up with just the 2 512mb sticks inside.

    Plus ive mixed and matched Ram before with PC mother boards, but I dont know if that is the same. Anyhow I still need an answer to my post above :p

  4. #4
    Weird RAM Problems with my Dual G5??!!
    Avalon's Avatar
    Member Since
    Jun 25, 2004
    Location
    Luxemburg, Europe
    Posts
    1,779
    Specs:
    PowerMac G5 Dual 2GHz (June 2004), 2.5GB, Airport, black 5G iPod 30GB, white MacBook 2.0 2GB
    The PowerMac G5 needs to have it's memory always paired, and the slots are paired like this:

    DIMM0 with DIMM2
    DIMM1 with DIMM3

    That means, if you only use two modules, they have to be either in DIMM0 and DIMM2, or in DIMM1 and DIMM3, another combination, like for example DIMM0 and DIMM1 or DIMM2 and DIMM3, won't work, your mac won't boot.

    You can mix RAM sizes, though always in pairs, and paired correctly. For example in your case, that would be the two 512-modules in DIMM0 and DIMM2, and two 256 modules in DIMM1 and DIMM3.
    If, like you did, DIMM0 has 512MB and DIMM2 has 256MB, the system will only use 256MB of DIMM0, to pair it with the other module.

    Your problem is not mixing sizes, or wrong modules, but simply putting them in the wrong slot.

  5. #5
    Weird RAM Problems with my Dual G5??!!
    Avalon's Avatar
    Member Since
    Jun 25, 2004
    Location
    Luxemburg, Europe
    Posts
    1,779
    Specs:
    PowerMac G5 Dual 2GHz (June 2004), 2.5GB, Airport, black 5G iPod 30GB, white MacBook 2.0 2GB
    Quote Originally Posted by Lucky_Penguin
    Plus ive mixed and matched Ram before with PC mother boards, but I dont know if that is the same. Anyhow I still need an answer to my post above :p
    There are also PC motherboards that needs the RAM paired... :cool:

    It depends on the Mac. The PowerMac G4 doesn't need pairing, so it can take whatever size in whatever slot and will recognise it.

  6. #6
    Weird RAM Problems with my Dual G5??!!
    rman's Avatar
    Member Since
    Dec 24, 2002
    Location
    Los Angeles, California
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    12,584
    Specs:
    2 x 3.0GHz Quad-Core, 6GB OS X 10.6.8 | 15in MacBook Pro 2.2GHz OS X 10.6.8 | 64GB iPad 2 WiFi
    Cool
    I thought you had to install the memory in pairs. Try placing the memory in the slots/banks DIMM0 and DIMM2. Or you can try slots/banks DIMM1 and DIMM3.
    Life isn't about waiting for the storm to pass, It's about learning to dance in the rain!

  7. #7
    Weird RAM Problems with my Dual G5??!!
    Avalon's Avatar
    Member Since
    Jun 25, 2004
    Location
    Luxemburg, Europe
    Posts
    1,779
    Specs:
    PowerMac G5 Dual 2GHz (June 2004), 2.5GB, Airport, black 5G iPod 30GB, white MacBook 2.0 2GB
    Quote Originally Posted by rman
    I thought you had to install the memory in pairs. Try placing the memory in the slots/banks DIMM0 and DIMM2. Or you can try slots/banks DIMM1 and DIMM3.
    That's what I tried to say... :black:

  8. #8
    Weird RAM Problems with my Dual G5??!!
    rman's Avatar
    Member Since
    Dec 24, 2002
    Location
    Los Angeles, California
    Posts
    12,584
    Specs:
    2 x 3.0GHz Quad-Core, 6GB OS X 10.6.8 | 15in MacBook Pro 2.2GHz OS X 10.6.8 | 64GB iPad 2 WiFi
    Cool
    Here is what Avalon is saying:

    DIMM0 - 512 MB DDR SDRAM
    DIMM1 - 256 MB DDR SDRAM
    DIMM2 - 512 MB DDR SDRAM
    DIMM3 - 256 MB DDR SDRAM

    or

    DIMM0 - 256 MB DDR SDRAM
    DIMM1 - 512 MB DDR SDRAM
    DIMM2 - 256 MB DDR SDRAM
    DIMM3 - 512 MB DDR SDRAM
    Life isn't about waiting for the storm to pass, It's about learning to dance in the rain!

  9. #9
    Weird RAM Problems with my Dual G5??!!
    rman's Avatar
    Member Since
    Dec 24, 2002
    Location
    Los Angeles, California
    Posts
    12,584
    Specs:
    2 x 3.0GHz Quad-Core, 6GB OS X 10.6.8 | 15in MacBook Pro 2.2GHz OS X 10.6.8 | 64GB iPad 2 WiFi
    Cool
    Quote Originally Posted by Avalon
    That's what I tried to say... :black:
    I did not see your posts. I guess I was sitting on it to long, before I replied.
    Life isn't about waiting for the storm to pass, It's about learning to dance in the rain!

  10. #10
    Lucky_Penguin
    Guest
    Thanks for the info, ill give it a shot and tell you what happens :dive:
    I actually had this funny feeling that the slot problems were the cause
    and I was planning on playing with it more, but now I know for sure.
    Ok let me go power down and play with it.
    Thanks again guys

  11. #11
    Lucky_Penguin
    Guest
    O **** yeaaaaa
    Ok it works now just switching the slots worked like a charm!
    Thanks again!
    Id buy you a beer if I saw you in public!

  12. #12
    Weird RAM Problems with my Dual G5??!!
    Avalon's Avatar
    Member Since
    Jun 25, 2004
    Location
    Luxemburg, Europe
    Posts
    1,779
    Specs:
    PowerMac G5 Dual 2GHz (June 2004), 2.5GB, Airport, black 5G iPod 30GB, white MacBook 2.0 2GB
    Quote Originally Posted by Lucky_Penguin
    Id buy you a beer if I saw you in public!
    Cheers! :cool:

  13. #13
    BEEEsH
    Guest
    I had the same problem with my mini you know . . . .

    wait a minute . . .

    lol.

  14. #14
    Weird RAM Problems with my Dual G5??!!
    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
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    28,477
    Specs:
    iMac late 2007 10.11.b4, iMac 2008 10.10.5, Macbook2007 10.7.5, Mac Mini 10.7.5, iPhone 3GS Note 8!!
    Quote Originally Posted by BEEEsH
    I had the same problem with my mini you know . . . .

    wait a minute . . .

    lol.

    Yeah, so did I. I tried to cram 8 Registered ECC PC4000 Dimms into the Mini, For some reason it would not post after that!

    :spook:

  15. #15
    Weird RAM Problems with my Dual G5??!!
    Avalon's Avatar
    Member Since
    Jun 25, 2004
    Location
    Luxemburg, Europe
    Posts
    1,779
    Specs:
    PowerMac G5 Dual 2GHz (June 2004), 2.5GB, Airport, black 5G iPod 30GB, white MacBook 2.0 2GB
    Quote Originally Posted by BEEEsH
    I had the same problem with my mini you know . . . .

    wait a minute . . .

    lol.
    With the mini it's a bit different...as it has only one slot, you need to cut the module in two, in order to get them correctly paired. :p

    Quote Originally Posted by dtravis7
    Yeah, so did I. I tried to cram 8 Registered ECC PC4000 Dimms into the Mini, For some reason it would not post after that!
    Hmm, I think you didn't solder them together....try that, and you'll see it will work like a charm. :p

    PS: Before anybody that reads this starts to cut his/her memory, or solder them together: IT IS A JOKE!! :cool:

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