RAM question

Discussion in 'General Hardware' started by Jz1397-5, May 23, 2002.

  1. Jz1397-5

    Jz1397-5 XP Bad Ass

    Philadelphia PA
    I am looking into some more RAM, and was wondering what the difference between ECC Unregistered and ECC Registered. Is there any proformance difference, or is it something else?

  2. Iceman

    Iceman Moderator

    I found this explanation to be the best. Not my words though....... hope this helps:D

    Registered SDRAM (aka 'buffered' SDRAM - the terms are
    interchangeable when used to describe SDRAM) are intended for
    workstations and servers. Basically all pins except the data and the
    clock pins) are buffered through a register. This reduces the loading
    by "buffering" the address and control inputs. The main advantage is
    that you can put more than 4 DIMMs on a memory controller - up to 8,
    IIRC. There's a one clock latency penalty (from the register), but
    sometimes this can be masked."

    "ECC SDRAM is a whole different thing. ECC is a type of fault
    detection/correction circuit that is used to detect and fix memory
    errors on the fly. Alpha and Beta particle impact ionization in a
    memory bit can cause a bit flip (0->1 or 1->0) which causes a memory
    error. With the old parity memory, your system could detect that a bit
    had bit flipped on memory read, but would then print "Parity Error"
    and freeze up - which prevents this bad data from being written, but
    erases all current data. ECC can determine one flipped bit in 64-bits
    and can detect an error in two bits (which causes a parity error
    shutdown as before)."

    "Registered memory is definitely intended for servers/workstations or
    systems with a lot of RAM (>2GB). ECC is argueably intended for anyone
    who cares a lot about data integrity on their system - which is not
    necessarily someone on a workstation."
  3. xsivforce

    xsivforce Prodigal Son Folding Team

    Texas, USA
    Short version: ECC is Error Checking and Correcting, or Error Correcting Code. It is a little slower.
  4. Jz1397-5

    Jz1397-5 XP Bad Ass

    Philadelphia PA
    Thanks all
  5. Syrus

    Syrus OSNN Addict

    On some mother boards take the Abit kr7a-133 which has 4 ram sockets it can use up to 3gigs of unregistered ram and 4gigs of registered ram.
    so i guess its up to you how much u want to spend and how much ram u want at the end of it all.
  6. dijital

    dijital Guest

    out of curiousity, since you already have 1gb ram, what do you need more for?
  7. Cosmin

    Cosmin Graphic Designer

    There is always space for better :D .
  8. Syrus

    Syrus OSNN Addict

    Always good to have alot of Ram, alot of Ram alot of resources.
  9. Nismo83

    Nismo83 OSNN AZN Addict

    Too much memory can eventually cause memory leaked. Keep this in mind though i agree with u that with more RAM more resources and even can disable the page file.
  10. Jz1397-5

    Jz1397-5 XP Bad Ass

    Philadelphia PA
    no no no, I am not getting ram for this computer (1024MB), I am buying for another creation of mine, the highly modded baby.
  11. DJ-Delicious

    DJ-Delicious Guest

    I have a question i have 1048 megs of DDR and i still use a page file. I Never use more than 500megs of memory; could i diasble the page file?
  12. Gouk

    Gouk Guest

    Despite technically supporting up to 4GB off memory, the maximum DDR memory support is actually about 3.5GB rather than 4GB. This limitation is caused by the current PC architecture in which the missing 0.5GB of memory addresses are reserved for PCI I/O space, AGP aperture mapping space and other onboard device I/O space. Thus although the chipset datasheet may claim memory support for up to 4GB, the system actually only offers about 3.5GB with four 1GB DDR DIMMs installed. Do not expect a BIOS fix and do not expect it to be different on any other motherboard - 32 bit processors only support 4GB of address space! Reducing your AGP aperture to 32MB may help matters by freeing up some AGP aperture mapping space (assuming you currently have a larger aperture set).