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Thread: 16 GB DDR3 1600 on GA-870A-UD3




  1. #1
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    Question 16 GB DDR3 1600 on GA-870A-UD3

    I have put a Corsair CMZ16GX3M4A1600C9 16 GB kit on my GA-870A-UD3. CPU is Athlon II x 4 630. BIOS is f5.

    It comes up with the memory at 1333, using the JEDEC #4 profile since it cannot use the XMP profile. When I set the memory frequency to 1600 instead of Auto-1333, it is not stable. I tried at at auto timings of 11.0, 11, 11, 29 and at the XMP timings of 9.0, 9, 9, 24. I also tried it at both auto voltages and increasing NB to 1.2v and memory to 1.6v.

    So far, I have not found anything that tests ok, except the JEDEC #4 profile. Does anyone have any suggestions?

  2. #2
    Chike is offline Senior Member
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    Default Re: 16 GB DDR3 1600 on GA-870A-UD3

    Try increasing CPU NB VID Control gradually up to 1.35v.
    To see improvement in memory performance you will need to use 240MHz ref clock with x6.66 memory multiplier, adjusting CPU multiplier to be close to it's spec frequency.

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    Default Re: 16 GB DDR3 1600 on GA-870A-UD3

    Quote Originally Posted by Chike View Post
    Try increasing CPU NB VID Control gradually up to 1.35v.
    To see improvement in memory performance you will need to use 240MHz ref clock with x6.66 memory multiplier, adjusting CPU multiplier to be close to it's spec frequency.
    So, you are saying I cannot use the 8.00 multiplier the motherboard provides?

  4. #4
    Chike is offline Senior Member
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    Default Re: 16 GB DDR3 1600 on GA-870A-UD3

    No, I was saying that the difference between DDR-1333 to DDR-1600 alone, will not be significant as increasing the FSB too.
    First try to get the memory stable with default 200MHz clock and x8.00 memory multiplier.
    Compare the differences betweenthe two settings. You can use MaxxMEM² - PreView or any other memory benchmark.
    Then try 244MHz clock, with CPU Ratio 11.5 and memory multiplier x6.66, and compare that too.
    The higher clock may require a slite increase of both NB Voltage Control and CPU NB VID Control.

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    Default Re: 16 GB DDR3 1600 on GA-870A-UD3

    Thanks, Chike. I understand now.

    I think I need to first test the modules and slots individually. I am currently using memtest86 on all 16G. It is showing error at four memory loacations, always in the 14th bit--0x00080000. Two errors near 3 GB amd two near 11 GB

  6. #6
    Chike is offline Senior Member
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    Default Re: 16 GB DDR3 1600 on GA-870A-UD3

    Is thos with DDR-1333 or DDR-1600 settings?
    It should be easier to set only one pair, installed at the same color slots than test the other, and finally make changes for all 4 modules if needed.

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    Default Re: 16 GB DDR3 1600 on GA-870A-UD3

    This is at DDR 1600 settings, with standard voltages.

    Ok, I'll test as pairs, first.

  8. #8
    Chike is offline Senior Member
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    Default Re: 16 GB DDR3 1600 on GA-870A-UD3

    BTW I have seen reviews of memory that actually clocked higher at lower voltage than it did at it's rated voltage, so more is not nesessarally better.

    Goot luck with testing.

  9. #9

    Default Re: 16 GB DDR3 1600 on GA-870A-UD3

    I've seen statements that the integrated memory controller of AMD CPU would not be very willing to operate above the 1333 MHz. Therefore, it's an OC challenge.

  10. #10
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    Default Re: 16 GB DDR3 1600 on GA-870A-UD3

    Quote Originally Posted by mv2devnull View Post
    I've seen statements that the integrated memory controller of AMD CPU would not be very willing to operate above the 1333 MHz. Therefore, it's an OC challenge.
    ???
    That was true for DDR2 and AM2 CPU's such as Phenom I.

    I wasn't able to single anything out by testing pairs so I went back to all four modules. I ran Memtest86 all night. Although there were no errors on pass 0, they started on pass 1. When I stopped it it was on pass 3, with 31 errors.

    I am now testing:
    Memory:
    FSB:DRAM 1:4 => 800 MHz
    1T/2T 2T
    CL 9.0
    tRCD 9
    tRP 9
    tRAS 24
    TwTr 5
    Trfc 160ns (all)
    Precharge 6
    WRT 10
    tRC 41
    RAS to RAS 6

    Voltages:
    DRAM 1.600v
    NB 1.240v
    CPU-NB VID +.050 = 1.2250v
    CPU +.025 = 1.4250v

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