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  1. #41
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    Quote Originally Posted by Silent Scone@ASUS View Post
    That's because MRC Fast Boot retains the last known settings in NVRAM, so routines are missed. It's easy to draw conclusions to things like "bugs" if one doesn't understand what constitutes as a pass / fail. You could relax CL by one clock and this would also likely stop the cold boot issues, too.
    If I use even 1.20v for VCCSA/VCCIO, my system sometimes may not booting with default xmp 3200 16-18-36 lol. But with OC to 3466 16-18-36 and 1.1v for VCCSA/VCCIO I can pass all RAM tests if MRC Fast Boot is enabled. I still don't understand anything.

  2. #42
    Administrator Array Silent Scone@ASUS's Avatar
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    Quote Originally Posted by EtoEgor View Post
    If I use even 1.20v for VCCSA/VCCIO, my system sometimes may not booting with default xmp 3200 16-18-36 lol. But with OC to 3466 16-18-36 and 1.1v for VCCSA/VCCIO I can pass all RAM tests if MRC Fast Boot is enabled. I still don't understand anything.
    The overclock isn't stable. These rails are not linear, more voltage can sometimes hurt just as much as too little depending on the CPU sample.

  3. #43
    ROG Member Array Aurosonic PC Specs
    Aurosonic PC Specs
    Laptop (Model)ASUS G501VW
    MotherboardASUS ROG MAXIMUS APEX XI bios 0231
    ProcessorIntel i9-9900k delided 5200@1.35v LLC5
    Memory (part number)2x8gb G.Skill Trident Z RGB F4-4600C18D-16GTZR @ 4600Mhz 17-19-19-38 CR2
    Graphics Card #1Gigabyte AORUS GeForce RTX™ 2080 Ti XTREME WATERFORCE WB 11G @2100/8100
    Sound CardRME Fireface UC
    Monitor2x Asus PG278Q
    Storage #1M.2 Samsung 970 Pro 512gb
    Storage #2M.2 Samsung 970 Evo 2Tb
    CPU CoolerEK-Velocity RGB - Nickel / Custom Watercooling
    CaseCaseLabs SMA8 custom
    Power SupplyCORSAIR AX1500i custom cablemod
    Keyboard Steelseries APEX RAW
    Mouse Logitech G9x Laser
    Headset Sennheiser HD250
    Mouse Pad Zowie
    Headset/Speakers Blue Sky Mediadesk 2.1
    OS Windows 10 1809
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    Aurosonic's Avatar
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    Turn MCH Full check to Enabled. I had lots of issues when it was on [Auto]
    9900k@5200@1.35v LLC5/Apex XI@0231/G-Skill F4-4600C18D-16GTZR/Aorus 2080ti xTream Wateblock@2100/8100

  4. #44
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    I disabled MCH full check and enabled MRC fast boot - no problems with boot anymore

  5. #45
    Administrator Array Silent Scone@ASUS's Avatar
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    Quote Originally Posted by EtoEgor View Post
    I disabled MCH full check and enabled MRC fast boot - no problems with boot anymore
    See what works for you, however, please note that disabling POST stress tests can often be a bandaid fix to an unstable overclock. Disabling these features can result in the system becoming unstable or dropping a memory module once in the OS.

  6. #46
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    Quote Originally Posted by Silent Scone@ASUS View Post
    See what works for you, however, please note that disabling POST stress tests can often be a bandaid fix to an unstable overclock. Disabling these features can result in the system becoming unstable or dropping a memory module once in the OS.
    I understand, but I use overclocking settings proven by months

  7. #47
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    Quote Originally Posted by Silent Scone@ASUS View Post
    See what works for you, however, please note that disabling POST stress tests can often be a bandaid fix to an unstable overclock. Disabling these features can result in the system becoming unstable or dropping a memory module once in the OS.
    Can you HEAR ME PLEASE?? When I dont use overclock it may doesnt start too!!! With full default xmp (3200 16-18-36 1.35v) and auto voltages!!! Even with 1.35 vccio/sa and 1.45v dram!! Even when I disable XMP and leave FULL AUTO settings! Even with huge boot voltages! It's full random! Memok doesnt work too! I get POSTed in safe mode every time (after 4 attempts to boot). It's 100% bios bug or my mb is broken, because I didnt have ANY problems with my old z370-g gaming even with OC to 3466 16-18-36 and 1.1v vccio/sa!

    But I will not be able to return it under warranty because the service center is unlikely to be able to detect such a problem! they will check that the system can boot at 2133mhz 17-17-39ram and will say that everything is fine!

    The only way to use the board is to catch the moment when it can boot with the selected parameters (the chance always with any parameters is ~3-5%) and go through training and then enable MRC fast boot and disable MCH check!

    So please fix your bios or just tell me how can I return MB as warranty case. I think that the memory contoller of my mb is broken. Now I can boot only with default 2133mhz 17-17-39
    Last edited by EtoEgor; 03-17-2019 at 05:14 AM.

  8. #48
    Administrator Array Silent Scone@ASUS's Avatar
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    1) Anything over JEDEC specification is considered an overclock.

    2) There are no bugs or issues with the UEFI causing your instability.

    3) Read this sticky: https://rog.asus.com/forum/showthrea...-and-using-XMP

  9. #49
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    Quote Originally Posted by Silent Scone@ASUS View Post
    1) Anything over JEDEC specification is considered an overclock.

    2) There are no bugs or issues with the UEFI causing your instability.

    3) Read this sticky: https://rog.asus.com/forum/showthrea...-and-using-XMP
    read this:
    *
    because I didnt have ANY problems with my old z370-g gaming even with OC to 3466 16-18-36 and 1.1v vccio/sa!
    *
    Last edited by EtoEgor; 03-17-2019 at 03:03 PM.

  10. #50
    Administrator Array Silent Scone@ASUS's Avatar
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    I did read your post, it's mostly inaccuracies. The memory controller is on the CPU, not the motherboard.

    There are no guarantees when it comes to memory overclocking. Did you check to see what sub timings you were running on the previous board?

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