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  1. #1
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    Asus Z390 F-Gaming + M.2 NVMe PCI-E SATA slot disablement

    hi

    i have asus z390 F-Gaming, samsung evo 970 NVME PCI-E as OS/Boot in slot M.2_1 (top slot by CPU)

    bios is auto and bandwith is x4 but 2 sata ports are disabled.

    i wonder if M.2_2 slot (bottom) will be the same and will also disable 2 sata ports if i move it.

    which slot should be used for OS/boot and what setup to avoid disablement please?

    there is no info in manual about sata5-6 be disabled. just only if you use it as sata but i have it in auto or pci-e but still 2 sata slots disabled..

    thank you for help

  2. #2
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    Quote Originally Posted by deejay2 View Post
    bios is auto and bandwith is x4 but 2 sata ports are disabled.

    there is no info in manual about sata5-6 be disabled. just only if you use it as sata but i have it in auto or pci-e but still 2 sata slots disabled..
    Check the manual more closely... Chapter 3.6.7:

    PCIEX16_3 Bandwidth
    [X2 Mode] Run at X2 mode with SATA6G_56 enabled.
    [X4 Mode] Run at X4 mode for higher performance with SATA6G_56 disabled.

  3. #3
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    thanks for reply

    so M.2_1 x4 will disable 2 sata5-6...why? it is PCI-E not sata?,,,,,,what about M.2_2...it will be the same....it does not matter what slot you will use?

    and what about if you have 2 nvme? how many sata slots will be disabled then?

  4. #4
    ROG Member Array Simon LeBon PC Specs
    Simon LeBon PC Specs
    MotherboardASUS Strix z390-E Gaming
    ProcessorIntel i5-9600k
    Memory (part number)G.SKILL Ripjaws V Series 32GB (2 x 16GB) DDR4 3600
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    If the z390-F is anything like the z370-e (which I have)... The M.2-1 does disable 2 of the SATA ports if used.

    However the M.2-2 does NOT. So if you use only one NVMe device... use it in the M.2-2 slot.... and you won't have any SATA ports disabled. If you need to use both, you'll lose 2 SATA slots. It's just a function of finite resources in the chipset. Fairly standard stuff. You'll want to double check the manual specific for the z390-F though.

  5. #5
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    thanks simon,

    your board is same like mine difference is just no wifi

    ok so M2_2 x4 will not disable any sata ports ,,,manual is not clear....previous post was correct about chapter stating sata5-6 disabled if x4 bandwith used in M.2_1.

    however it is not stated that M2_2 will not disable it as well..

    so now can i just move evo 970 M.2 NVME with system/boot to M.2_2 slot from M.2_1 without issues or not?
    Last edited by deejay2; 01-09-2019 at 04:32 AM.

  6. #6
    ROG Member Array pillainp PC Specs
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    Laptop (Model)Asus FX553VD w 960 Evo 250GB + Samsung 860 Evo 2TB + 16GB DDR42400
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    M.2_1 will only disable SATA port if it is run in SATA mode. For your motherboard, that is SATA6G_2.

    In PCIe mode, no SATA ports are disabled.

    Go into BIOS Boot Configuration Configuration and try setting the mode from AUTO to PCIe and see if the two ports are enabled again.

    You will also probably need to set BIOS to load the PCIe drivers first (under Boot from PCI-E/PCI Expansion Devices), or you may get a BSOD from the system not detecting any legacy (SATA for you and me ) drives to boot from.

    You are using a 970 Evo as your boot drive the same as I am. I am running from M.2_1 in PCIe mode with no ports disabled. Indeed my Samsung 840 Pro is running fine on SATA6G_1 and one of my WD Blacks on SATA6G_2.
    Last edited by pillainp; 01-09-2019 at 08:53 AM.

  7. #7
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    pillainp-->

    M.2_1 slot (TOP slot) ....in auto or pci-e in bios and badwith x4...will always disable my 2 sata 5-6 (if x2 bandwith used then no disablement)

    i will try M.2_2 (bottom) slot to see if the same....as suggested by simon

    looks like 2 specialists, 2 different answers
    Last edited by deejay2; 01-10-2019 at 12:33 AM.

  8. #8
    ROG Member Array Simon LeBon PC Specs
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    MotherboardASUS Strix z390-E Gaming
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    Quote Originally Posted by deejay2 View Post
    pillainp-->

    M.2_1 slot (TOP slot) ....in auto or pci-e in bios and badwith x4...will always disable my 2 sata 5-6 (if x2 bandwith used then no disablement)

    i will try M.2_2 (bottom) slot to see if the same....as suggested by simon

    looks like 2 specialists, 2 different answers
    Well, neither one of us are claiming to be "specialist." I'm practically new here and simply giving you advice (free of charge, even) based on a similar board I have had experience with.

    If you ONLY want help from official ASUS reps, just say so so the rest of us can avoid you.

    /rant

    Now, I can tell you that if you use M.2_2 you will have no SATA conflicts. Because that is basically how the z390-E and -F were made to work.

  9. #9
    ROG Member Array pillainp PC Specs
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    Memory (part number)G.Skill F4-4000C18D-16GTZR 16GB
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    MonitorDell UP2716D 27"
    Storage #1Samsung 970 Evo 250GB M.2 PCIe NVMe
    Storage #2Samsung 840 Pro 256GB; 3x WD Black 2TB
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    Quote Originally Posted by deejay2 View Post
    pillainp-->

    M.2_1 slot (TOP slot) ....in auto or pci-e in bios and badwith x4...will always disable my 2 sata 5-6 (if x2 bandwith used then no disablement)

    i will try M.2_2 (bottom) slot to see if the same....as suggested by simon

    looks like 2 specialists, 2 different answers
    Definitely not a specialist here.

    Your motherboard manual only makes mention of M.2_1 disabling SATA ports (specifically SATA6G_2) when in SATA mode.

    It makes no mention of any other ports being disabled by either M.2_1 or M.2_2.
    Miniatura de Adjuntos Miniatura de Adjuntos MaxthonSnap20190110133251.png  


  10. #10
    ROG Member Array Simon LeBon PC Specs
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    So how did it go @deejay2 ?

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