What does "ECC" and "Non-ECC" mean (RAM)

Discussion in 'Macintosh Computers' started by thomasp, Nov 20, 2005.

  1. macrumors 6502a

    Joined:
    Sep 18, 2004
    Location:
    UK
    #1
    Firstly, sorry if this is in the wrong forum - mods feel free to move it :)


    I've noticed when looking on the Apple store at computers (especially the new G5's), and when looking at PB RAM, there's often either "ECC" (not so much with the PBs) and "Non-ECC" after the RAM name.

    What does this mean?

    Also, on the Apple Store, ECC RAM seems about £100 more expensive per Gb than Non-ECC RAM...

    :confused:
     
  2. macrumors 65816

    Kernow

    Joined:
    Sep 30, 2005
    Location:
    Kingston-Upon-Thames
    #2
  3. macrumors G4

    Chundles

    Joined:
    Jul 4, 2005
    #3
    ECC = Error Correcting Code

    It means that for high priority workstations and servers that random bit flips don't screw up the final result.

    The original PowerMac G5 cluster at Virginia was only a proof-of-concept supercomputer cluster because the PowerMacs didn't use ECC RAM at the time. The PowerMacs were used to demonstrate the viability of Mac OS X as a server OS and were sold cheaply online when the xServe was introduced which could use ECC RAM.
     
  4. thread starter macrumors 6502a

    Joined:
    Sep 18, 2004
    Location:
    UK
    #4
    So for normal, everyday use, is Non-ECC RAM OK?
     
  5. macrumors G4

    Chundles

    Joined:
    Jul 4, 2005
    #5
    Unless you count "normal everyday use" as rocket science, long range weather prediction or complex molecular modeling you should be right with the regular stuff.

    ECC RAM is really an option that has been added to make the PowerMac look more professional and "super-computer like" than it was before. It's for the big time mathematics like computing load distribution on aeroplane wings and stuff like that.
     
  6. macrumors G4

    Joined:
    May 10, 2004
    #6
    A bit error can also result in a computer crash.



    BTW, EEC = European Economic Community
     
  7. macrumors G4

    Chundles

    Joined:
    Jul 4, 2005
    #7
    Yeah, that too...
     
  8. thread starter macrumors 6502a

    Joined:
    Sep 18, 2004
    Location:
    UK
    #8
    Yeah, I kind of noticed that shortly after posting this thread, and didn't bother going back to edit it, because the original title would have remained :) :eek:
     
  9. Moderator

    Nermal

    Staff Member

    Joined:
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    Location:
    Whakatane, New Zealand
  10. thread starter macrumors 6502a

    Joined:
    Sep 18, 2004
    Location:
    UK
    #10
    Thanks :)


    And thanks for the help, everyone else :D
     

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