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  1. #1
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    C7H NVMe slot. Which one?

    Does it matter which slot I use? Wasn't sure if one shares bandwidth with the #1 PCIe lanes or something.
    Thanks.

  2. #2
    ROG Guru: Brown Belt Array RedSector73 PC Specs
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    Quote Originally Posted by Thick8 View Post
    Does it matter which slot I use? Wasn't sure if one shares bandwidth with the #1 PCIe lanes or something.
    Thanks.
    Graphics that explains, borrowed from this forum ... i think... anyway M2.1 is best to use / not shared. Which if you check manual P1-25 is bottom one.
    Click image for larger version. 

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    The procedure for install of windows on a new NVMe drive.

    Enter BIOS, Advanced mode,

    1 - Make sure you unplug all SATA and USB drives, the M.2 drive has to be the only drive installed.
    2 - Go into the bios, under the boot tab there is an option for CSM, make sure it is disabled.
    3 - Click on secure boot option below and make sure it is set to other OS, Not windows UEFI.
    4 - Click on key management and clear secure boot keys.
    5 - Insert a USB memory stick with a UEFI bootable iso of Windows 10 on it.
    6 - Press F10 to save, exit and reboot.
    7 - Windows will now start installing to your NVME drive as it has its own NVME driver built in.
    8 - When the PC reboots hit F2 to go back into the BIOS, you will see under boot priority that windows boot manager now lists your NVME drive.
    9 - Click on secure boot again but now set it to Windows UEFI mode.
    10 - Click on key management and install default secure boot keys
    11 - Press F10 to save and exit and windows will finish the install.


    PS - To be Windows 11 ready do this after the above, (and assuming you have above 1st Gen Ryzen)

    Enter BIOS, Advanced mode.

    Navigate to
    Advanced Menu -> AMD fTPM Configuartion
    TPM Device Selection: Firmware TPM

    Save & Exit

    Hope you find this helpful.
    Last edited by RedSector73; 08-05-2021 at 11:56 AM.

  3. #3
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    M.2_1 is best to use because it gets its lanes directly from the CPU. It is not the end of the world to use M.2_2 in cases where maybe you have a larger SSD or just happen to lay it out that way. There is a very small performance penalty, 4.3% in my experience, and a small temperature penalty, about 1-2 degrees C on the chipset temp, in my experience.

    Keep in mind that these calculations are based on a C8H though with dual PCIe 4.0 x 4 SSDs installed. Identical SSDs in both slots.

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