Power Mac G5 quad ram question

Discussion in 'PowerPC Macs' started by M3Stang, Dec 4, 2015.

  1. M3Stang macrumors newbie

    Joined:
    Oct 26, 2015
    #1
    Hey guys decided to pull my old power Mac G5 out of the closet and use it for some good ole logic 8 fun. It's been pretty slow lately and even briefly flashed the finder folder at startup so I think this old hard drive is on its way out so I ordered an ssd for it pretty inexpensively. Just for kicks I was looking at ram and found it it supports 16gb of ram. It has 8gb in it right now but I'm finding 16gb of pc2-6400 really cheap online. The cheaper ones are classified as "server memory". I was wondering if anyone on here could chime in as to whether or not any of that matters or not for a power Mac G5 quad. They seem to be called pc2-6400p ram and its buffered as well I believe. Thanks!
     
  2. Dronecatcher macrumors 68000

    Dronecatcher

    Joined:
    Jun 17, 2014
    Location:
    Lincolnshire, UK
    #2
    Tread carefully...in theory the Quad is happy with server RAM (not mixed with desktop though) - however, I recently bought 8Gb of server RAM and none of it was recognised.
     
  3. bunnspecial macrumors 603

    bunnspecial

    Joined:
    May 3, 2014
    Location:
    Kentucky
    #3
    The Quad is perfectly content with ECC RAM(be sure you pair ECC with non-ECC) but registered RAM is a big NO. In fact, working from memory I think registered DDR2 is keyed differently from non-registered, so it won't fit.

    Look at the last letter of the RAM carefully-if what you're buying is marked PC2-6400U, it should be fine, while PC2-6400R is off limits.
     
  4. M3Stang thread starter macrumors newbie

    Joined:
    Oct 26, 2015
  5. bunnspecial macrumors 603

    bunnspecial

    Joined:
    May 3, 2014
    Location:
    Kentucky
    #5
    PC2-4200U is the original spec ram, but anything faster will work fine also.

    I think I'm running a combination of 4200, 5300, and 6400 in my own personal Quad-it's basically whatever I could scrounge up for free.
     
  6. jbarley macrumors 68030

    jbarley

    Joined:
    Jul 1, 2006
    Location:
    Vancouver Island
    #6
    My G5 quad has the Apple original memory in it, still runs without any errors.


    Type: DDR2 SDRAM
    Speed: PC2-4200U-444
     
  7. user406 macrumors newbie

    Joined:
    Dec 16, 2015
    #7
    1. The best configuration of RAM is PC2-4200E. Because not all DDR2-800 will have a latency 4-4-4@533MHz.
    2. PC2-4200P - Should be parity. Specs are not allow to use this type.
    3. PC2-4200U or just PC2-4200 - Unbuffered/unregistered. Regular type. Specs are allow to use this type.
    4. PC2-4200E - Regular + Error Code Correction. This is the best way to go. Specs are allow to use this type.
    5. PC2-4200S - SO-DIMM for laptops. Specs are not allow to use this type.
    6. PC2-4200F - Fully buffered. Specs are not allow to use this type.

    Parity vs ECC=almost the same results but with different method of work. G5QUAD supports 8*2Gb modules officially. There are information over the web that 8*4Gb also works (32Gb). Has been shipped with 10.4 or later. Latest OS could be used 10.5. Both versions addresses more than 4Gb of RAM.
     

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