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F4-3200C16D-16GVKB XMP problem

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  • F4-3200C16D-16GVKB XMP problem

    So I recently purchased the following parts:
    • i7 7700k
    • asus z270-a
    • G.Skill 16GB (2x8GB), Ripjaws V CL16-18-18

    And the problem is that I can not get the XMP setting stable at all. The best test for this is running memtest86 v7.3 test #6 (block move) on loop, like 50 passes.

    With just XMP enabled, I get two errors at a time, during some of the passes (like this). The z270-a sets the VCCSA voltage to 1,240v automatically when the memory is running XMP/3200MHz and similarly it sets VCCIO voltage to 1,128v when the XMP is enabled.

    I set the VCCIO voltage manually to 1,200v and this allowed me to get 37 passes before I saw two errors so I also tried settings of 1,225v but I saw the errors a bit earlier this time. Now the thing is, I actually got myself another kit for testing and it has exactly the same problem as the one that I already had, making me believe that the problem is actually elsewhere and the ram is just fine. Also the errors seem to always be on quite different addresses.

    To me it feels like that there is something going on with my motherboard or maybe the CPU's IMC is just bad and is not able to run the ram even at 3200MHz. I have been running the sticks at jedec standards (2133MHz, 15-15-15-34, 1,20v) and it seems to work, but I think I am going to test even this setup with the similar memtest86 test6 method to see if I still get errors.

    EDIT: Yep, 2133MHz settings indeed do work without any problems in memtest86.
    Last edited by Renzo; 04-01-2017, 02:21 AM.

  • #2
    Hi, same problem here:

    i7 7700k @ 4.8 Ghz
    Gigabyte Aorus Z270X K5.
    DDR4 2*8Go 3200 Mhz Trident Z RGB
    Works à 2133 Mhz, but with XMP, the computer is unstable. Even with the CPU stock.
    I've tried to set Cas and timing + DRAM voltage @1.35 manually, but it's still unstable, BSOD, Freeze...

    EDIT: F4 Bios Version
    Last edited by luxaivo; 04-03-2017, 05:23 AM.

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    • #3
      I have might found a solution. Apparently increasing VCCIO voltage did nothing good, but increasing VCCSA voltage made a difference. I was able to get 50 out of 50 passes in memtest86 block move test (test #6) in 1h 13mins when using VCCSA 1,250v and VCCIO 1,200v. Before this, the best I could do was 1-2mins without errors just using XMP setting and ~40mins stability with VCCIO voltage of 1,200v and VCCSA on auto (bios showing 1,240v but no idea what the actual voltage setting is).

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      • #4
        Do you know safe value for the VCCSA and VCCIO?

        I'll try your settigns to see if i'm able to run a full memtest.

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        • #5
          Unfortunately I am not sure about the safe values for VCCSA and VCCIO. I have tried to look information about these voltages, and apparently they should be safe at 1,25v / 1,2v respectively. In asus kaby lake OC guide they give information about a range of required SA/IO voltages that you could try depending on your memory speed:
          Code:
          DDR4 frequency range	Required CPU VCCIO Voltage range	Required CPU System Agent Voltage range
          DDR4-2133 ~ DDR4-2800	1.05V ~ 1.15V	1.05V ~ 1.15V
          DDR4-2800 ~ DDR4-3600	1.10V ~ 1.25V	1.10V ~ 1.30V
          DDR4-3600 ~ DDR4-4266	1.15V ~ 1.30V	1.20V ~ 1.35V
          Since they are specific about those voltages, I am guessing it should be (somewhat) safe to use the highest voltages you see.

          Also if you want to make memtest86 faster, just select test number 6 (block move) and make it loop for 50 times or so. I did pass "all the tests" (default) in memtest86 4 times in 4h+ hours, but by running test 6 only started revealing the errors.
          Last edited by Renzo; 04-04-2017, 07:12 AM.

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          • #6
            They key is to test and make sure the system needs more Voltage, rather than just increasing Voltage despite no positive feedback from the system. For this reason, scaling up from say 2800 -> 3000 -> 3200 is better than just plugging in all the settings and increasing Voltages in hopes that it will just work.

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