Mac Pro Ram ECC Errors - help

Discussion in 'Mac Basics and Help' started by swo, Aug 19, 2006.

  1. swo macrumors newbie

    Joined:
    Aug 19, 2006
    #1
    I just got a new mac pro.
    I received 2 512's of Ram From Apple.
    I bought 4 of the 1gig Ram from OWC (says its to Apple specs).

    I have the 4 1gigs in the top 4 slots,
    and the 2 512's on the Bottom.

    I have had my machine on for the last 24 hours or so since i got it -
    I am getting a LOT of ECC errors on the A1 riser 1gig Ram
    and a few and the B1 riser - 512.

    Should I be worried about this,
    and is there any other way to test my RAM to make sure it is okay.

    The A1 riser worries me with : 365288143 errors

    Here is the Report from the Apple Profiler:
    DIMM Riser A/DIMM 1:

    Size: 1 GB
    Type: DDR2 FB-DIMM
    Speed: 667 MHz
    Status: ECC Errors
    ECC Correctable Errors: 365288143

    DIMM Riser A/DIMM 2:

    Size: 1 GB
    Type: DDR2 FB-DIMM
    Speed: 667 MHz
    Status: OK

    DIMM Riser A/DIMM 3:

    Size: 1 GB
    Type: DDR2 FB-DIMM
    Speed: 667 MHz
    Status: OK

    DIMM Riser A/DIMM 4:

    Size: 1 GB
    Type: DDR2 FB-DIMM
    Speed: 667 MHz
    Status: OK

    DIMM Riser B/DIMM 1:

    Size: 512 MB
    Type: DDR2 FB-DIMM
    Speed: 667 MHz
    Status: ECC Errors
    ECC Correctable Errors: 110

    DIMM Riser B/DIMM 2:

    Size: 512 MB
    Type: DDR2 FB-DIMM
    Speed: 667 MHz
    Status: OK
     
  2. Sun Baked macrumors G5

    Sun Baked

    Joined:
    May 19, 2002
    #2
    Besides mixing things up...

    To get the benefit of the 4 channel memory, the 4 GB needs to be spit to 2 risers in the first DIMM spots on each Riser A&B, with the last 1 GB filling up Riser A.

    While you are switching things around, you can always move the erroring memory to the other riser.

    ---

    You have 4 available channels in 2 branches -- channel 0/1 on Riser A and channel 2/3 on Riser B. So to get all channels on at the same time, same memory 2 risers same DIMM slots.

    [​IMG]
     
  3. swo thread starter macrumors newbie

    Joined:
    Aug 19, 2006
    #3
    helpful advice

    thanx so much - !
    I really appreciate you taking the time to help out.
    I'll move the Ram to its proper places now.

    Is there a chance that the one stick getting all the errors is defective?
     
  4. Sun Baked macrumors G5

    Sun Baked

    Joined:
    May 19, 2002
    #4
    Yes it could have a problem ... but you'll find out once you move the DIMMs around to split them into the two risers and move Apple's memory into the right spot.

    http://manuals.info.apple.com/en/MacPro_MemoryDIMM_DIY.pdf

    Apple has a decent graphic on DIMMs, but it doesn't tell you anything about how to set up 4 channel memory.
     
  5. chatin macrumors 6502

    chatin

    Joined:
    May 27, 2005
    #5
  6. Silentwave macrumors 68000

    Joined:
    May 26, 2006
    Location:
    Gainesville, FL
    #6
  7. swo thread starter macrumors newbie

    Joined:
    Aug 19, 2006
    #7
    cheaper not always better

    sun baked ...
    thank you kindly for the advice. I am about to try switching the ram around now. I will watch to see if that also makes a difference with the Errors.
    If the errors do keep up on that one stick of RAM -
    I will be sending it back.

    Chatin, Silent Wave:
    I like OWC and use them for most of my mac hardware -
    i try to keep supporting a company that has always been of good service to me.
    Price is not the most important aspect in why i choose a product, I've learned in the past that the cheapest option is often cheapest for a reason.
    It would be a little irrational to spend the money on a top of the line machine like the Mac Pro, and then purchase substandard Ram for it. (NewEgg's might be as good, but that hasn't been proved yet - and OWC's claimed to be to Apple's specs and were available right away).
    That being said I could have purchased a defective and expensive stick of Ram - in that case I will be requesting a replacement!

    Thanx to all of you for the advice.
     

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