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F4-3866C18Q-32GTZR on ASUS Maximus XI Hero Overclocking

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  • F4-3866C18Q-32GTZR on ASUS Maximus XI Hero Overclocking

    Hi,

    I've noticed strange issue when I've tried to overclocked my F4-3866C18Q-32GTZR on ASUS Maximus XI Hero.

    I can get max 3900MHz 17-17-17-36 2T @VCCIO 1.10V, VCCSA 1.15V in DRAM Timmings Mode 2 (1st screen). If I go higher Write to memory bandwith drops to ca. 30000MB/s (Copy too) - 2nd screen . I can't get higher bandwith in Mode 2.
    In Mode 1 I'm able to get 4133MHz, memory bandwith looks pretty well, Karhu RAM Test 12000% passed, but WinRAR extraction of big (>10GB) rar file fails (CRC errors)

    Is there any explanation of above issue?

    regards
    Attached Files

  • #2
    What BIOS version are you using?

    Have you tried boosting DRAM Voltage and/or SA Voltage for DDR4-4133?

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    • #3
      Bios 905 and 1001. Increasing voltages does not help.

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      • #4
        Check sub timings to see if they are correct. May need to manually input them or adjust in case they are changing when set to a value between 3900-4133 as you mentioned.

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        • #5
          What timings should I try @4133?

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          • #6
            See if the sub timings are the same when running 3866 and 4133. There's no reason performance drops when running at a higher frequency unless something else was not configured properly.

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            • #7
              These are my timings for 3900MHz (1st row) and 4000MHz (2nd row). Should I change something for 4000MHz to avoid performance drops?
              Attached Files

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              • #8
                Thx. Success !!!

                I've copied 3rd timings from 3900MHz profile and I've got 4133MHz @18-18-18-36-2T (DRAM Voltage 1.40V, VCCIO 1.15V, VCCSA 1.15V) without performance drops.

                Are these voltages safe for my F4-3866C18Q-32GTZR?
                Attached Files
                Last edited by cniedzi; 05-03-2019, 08:22 AM.

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                • #9
                  Very good actually, looks like you did a great job.

                  Enjoy

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