Low Memory Bandwidth Problem (HELP)

Discussion in 'General Hardware' started by MTL, May 28, 2006.

  1. MTL

    MTL Maha Guru

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    Graphics Card::
    EVGA 7900GTO SLI
    I have been noticing a few problems with the memory I installed a few weeks ago.

    I have:

    939 Athlon64 3200+
    MSI K8N Diamond Mobo
    2X 512 MB PC3200 Kingston ValueRAM @ 2.5-3-3-7 2T

    Here are the readouts from SIS Sandra 2007:
    RAM Bandwidth Int Buff'd iSSE2 : 2233 MB/s
    RAM Bandwidth Float Buff'd iSSE2 : 2235 MB/s

    Here is my PCMark 2004 Score:
    3591

    Both these readings are WAY too low for this kind of system compared to others benchmarked.

    How can I rectify this!?!?!?!

    Here are the rest of the Sandra diagnostics:

    Int Buff'd iSSE2 (Integer STREAM) Results Breakdown
    Assignment : 2195MB/s
    Scaling : 2193MB/s
    Addition : 2273MB/s
    Triad : 2273MB/s
    Data Item Size : 16 byte(s)
    Buffering Used : Yes
    Offset Displacement Used : Yes
    Bandwidth Efficiency : 84% (estimated)

    Float Buff'd iSSE2 (Float STREAM) Results Breakdown
    Assignment : 2197MB/s
    Scaling : 2195MB/s
    Addition : 2275MB/s
    Triad : 2273MB/s
    Data Item Size : 16 byte(s)
    Buffering Used : Yes
    Offset Displacement Used : Yes
    Bandwidth Efficiency : 84% (estimated)

    Performance Test Status
    Run ID : XXXXX
    Memory Used by Test : 512MB
    NUMA Support : No
    SMP Test : No
    Total Test Threads : 1
    Multi-Core Test : No
    SMT Test : No
    Dynamic MP/MT Load Balance : No
    Processor Affinity : P0C0T0
    System Timer : 3.6MHz
    Page Size : 4kB
    Use Large Memory Pages : No

    Chipset 1
    Model : Advanced Micro Devices (AMD) Athlon 64 / Opteron HyperTransport Technology Configuration
    Front Side Bus Speed : 2x 1005MHz (2010MHz data rate)
    In/Out Width : 16-bit / 16-bit
    Maximum Bus Bandwidth : 8040MB/s (estimated)

    Logical/Chipset 1 Memory Banks
    Bank 0 : 256MB DDR-SDRAM 2.5-3-3-7 2CMD
    Bank 1 : 256MB DDR-SDRAM 2.5-3-3-7 2CMD
    Bank 2 : 256MB DDR-SDRAM 2.5-3-3-7 2CMD
    Bank 3 : 256MB DDR-SDRAM 2.5-3-3-7 2CMD
    Channels : 1
    Bank Interleave : 4-way
    Speed : 2x 167MHz (334MHz data rate)
    Width : 64-bit
    Memory Controller in Processor : Yes
    Cores per Memory Controller : 1 Unit(s)
    Maximum Memory Bus Bandwidth : 2672MB/s (estimated)


    PLEASE HELP ME!!!!!!
     
  2. slewis64

    slewis64 Member

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    Graphics Card::
    BFG 8800 GTX OC2
    looking at the info supplied i would say you have two problems the first is your timings 2.5-3-3-7 2T you need to change to T1 instead of T2 if that is possible on that mobo the second is you are not running in duel channel mode make sure your memory sticks are in either both of the green slots or both of the purple slots not one in green and one in purple making these changes should double your bandwidth.

    Hope this helps
     
  3. bigpipe

    bigpipe Watson Guru

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    Graphics Card::
    970 GTX
    okay, i see three probs here if you are using two 512meg sticks.
    First your not running dual channel. second you are running 2t, should be 1t and third your memory is running at 333 Mhz not at 400 Mhz.
    Go to your mem settings and either configure it manually or let it read from the SPD. You may need to move one of the modules to a different slot on the mother board to run dual channel, check the layout in your mother board manual.
     
    Last edited: Jun 2, 2006
  4. slewis64

    slewis64 Member

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    Graphics Card::
    BFG 8800 GTX OC2
    by bigpipe "and third your memory is running at 333 Mhz not at 400"

    Well spotted bigpipe i missed that one too tired or too drunk well that's my excuse anyway :)
     

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