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  1. #1
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    Join Date
    Aug 2018

    Mixing M.2 NVMe with SATA

    Just bought the Z390-I, which uses the mITX form factor. It has 2 x M.2 slots and 4 SATA6 ports. I'm waiting on my NVMe drives to arrive, so I can't test things out myself at the moment. if anyone can clarify how my proposed setup would work. There's something I'm not sure about.

    So, the idea is to use two M.2 drives in NVMe mode (one drive will be dedicated to Windows, the other drive will be dedicated to Linux - I specifically don't want to partition a single drive for both OSs. Both drives are Samsung 970 EVO). Now, I have two other SATA6 drives that I want to use for general storage purposes. Those two drives are Samsung 860 Pro.

    In the manual it states "When the M.2_1 socket is operating in SATA mode, SATA port 2 will be disabled." I get that. However, my M.2 drives will not be in SATA mode, but NVMe (i.e., PCI-e) mode.

    1) Will any SATA6 ports get disabled if both my M.2 drives are in NVMe mode? I'm seeing posts on this forum and for mobos of other manufacturers that, in-fact, NVMe mode will still disable SATA6.

    2) Will I be able to run both M.2 drives at full speed? From the overview page ( I see it listing "1 x 2242-2280 (at front) supports SATA & PCIe 3.0 x4 modes ; 1 x 2242-2280 (at rear) supports SATA & PCIe 3.0 x4 modes" and "1 x PCIe 3.0 x16" (for my discrete GPU). So I'm guessing from this that I will be able to maintain full speeds for both drives, but not sure because I can't seem to find any info on the total number of lanes. In other words, the two M.2 ports may be capable of independently running at x4, but as soon as you put two drives together the x4 goes to x2+x2. That's what I'm not sure about.
    Last edited by usernameistooshort; 02-05-2019 at 05:27 AM.

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