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Thread: need help underclocking ram




  1. #1
    Join Date
    Jul 2008
    Location
    Boston,MA
    Posts
    78

    Default need help underclocking ram

    I have GA-X48-DS4 and have been tweeking the ram i have Mushkin XPS2-8500 the setting below post fine not problems 100% stabel but ram runs at strap 2.40b 5:6

    Robust Graphics Booster___________ [Auto]
    CPU Clock Ratio ____________ [8]
    CPU Host Clock Control_ [Enabled]
    CPU Host Frequency (MHz)__________ [450]
    PCI Express Frequency (Mhz)_______ [100]
    C.I.A. 2__________________________ [Disabled]
    System Memory Multiplier (SPD)____ [2.40B] =1080MHz
    DRAM Timing Selectable_______ SPD __ [Manual]

    Performance Enhance = [Standard]

    CAS Latency Time________________ 5
    Dram RAS# to CAS# Delay_________ 5
    Dram RAS# Precharge Delay_______5
    Precharge Delay (tRAS)__________ 15

    ACT to ACT Delay (tRRD)_________ 3
    Rank Write to READ Delay________ 4
    Write to Precharge Delay_________ 4
    Refresh to ACT Delay______________ 48
    Read to Precharge Delay__________ 3
    Static tRead Value_______________7
    Static tRead Phase Adjust________ AUTO

    CPU/PCIEX Clock Driving Control [800mV]
    CPU Clock Skew Control [normal]
    GMCH Clock Skew Control [Normal]

    System Voltage Control____ [Manual]
    DDR2 OverVoltage Control__ [+0.300V]
    FSB OverVoltage Control___ [+0.1V]
    (G)MCH OverVoltage Control [+0.150V]

    I have been trying to get ram to run 1:1 @900 but i can not get past BIOS post.Im not sure why i taking the ram down in speed and thought i would be able to tighting up timming and run 1:1 if any one can tell me why this seems so hard .I tried uping timming lowing voltages but just does not what to post @1:1 900 strap 2.00D
    Was hoping to run at 5-5-4-13@900
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  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: need help underclocking ram

    Try this for 900 >>>>

    Robust Graphics Booster___________ [Auto]
    CPU Clock Ratio ____________ [8]
    CPU Host Clock Control_ [Enabled]
    CPU Host Frequency (MHz)__________ [450]
    PCI Express Frequency (Mhz)_______ [100]
    C.I.A. 2__________________________ [Disabled]
    System Memory Multiplier (SPD)____ [2.00C or D] =900MHz
    DRAM Timing Selectable_______ SPD __ [Manual]

    Performance Enhance = [Standard]

    CAS Latency Time________________ 4/5
    Dram RAS# to CAS# Delay_________ 5
    Dram RAS# Precharge Delay_______5
    Precharge Delay (tRAS)__________ 12/15

    ACT to ACT Delay (tRRD)_________ 3
    Rank Write to READ Delay________ 3-6
    Write to Precharge Delay_________ 6-8 ( May need 8-10)
    Refresh to ACT Delay______________48-52
    Read to Precharge Delay__________ 3-5
    Static tRead Value_______________7-8
    Static tRead Phase Adjust________ AUTO

    CPU/PCIEX Clock Driving Control [800mV]
    CPU Clock Skew Control [normal] 50-100ps
    GMCH Clock Skew Control [Normal] 100-200ps

    System Voltage Control____ [Manual]
    DDR2 OverVoltage Control__ [+0.300V]
    FSB OverVoltage Control___ [+0.1V]
    (G)MCH OverVoltage Control [+0.150V] << May need a bit more, but try above timings first

  3. #3
    Join Date
    Sep 2008
    Location
    Canberra, Australia
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    206

    Default Re: need help underclocking ram

    you'd probably find that the RAM runs more stable if you lower the CAS instead of the Precharge and up the northbridge voltage. In my opinion you shouldn't skew the RAM when underclocking and you shouldnt do more than 100 clock cycles on the CPU at these frequency. Also, you might try changing the strap to 333MHz just to test stability
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  4. #4
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: need help underclocking ram

    Hey Bong, you mind sending me all the info you can on Skews? I could use some learning in this area for sure, hence my random ranges

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