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  1. #1
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    Maximus XI Apex and Dimm.2 M.2 SSD speed limit clarification.

    Hi guys

    I recently bought myself two Adata SX8200 PRO SSDs and plugged them in the Dimm.2 module. Ran a CrystalDiskMark bench and noticed that on one of the M.2 SSDs the sequential read and write performance was half of what the other SX8200 PRO had. About ~1750 MB/s. I checked my settings in the BIOS, but could not find anything wrong there. I then confirmed the performance difference with Adata SSD Toolbox, one SSD runs at Gen3 4X mode and the other at Gen3 2X.

    My system specs : XI Apex with BIOS 1105, 9900K, 32GB RAM, singel 2080Ti and just one other storage device, a Samsung 860 EVO SATA SSD. Windows 10 1903 fully updated, and using Microsoft NVMe driver.

    Is this caused by a BIOS bug or is it a Z390 platform limitation?

    Thanks for any reply

  2. #2
    ROG Guru: Yellow Belt Array Ch3vr0n PC Specs
    Ch3vr0n PC Specs
    MotherboardAsus Maximus XI Formula
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    Probably a misconfiguration in the bios (rather than a bug). It's definitely not a Z390 platform limitation, at worst it's the dimm.2 implementation of asus, this is not something specified in the Z390 chipset i think.

    I'm running 4 standard HDDs, 1 samsung 970 pro, 1 960 pro and 3 optical drives all at full speed.

  3. #3
    New ROGer Array
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    Quote Originally Posted by Ch3vr0n View Post
    I'm running 4 standard HDDs, 1 samsung 970 pro, 1 960 pro and 3 optical drives all at full speed.
    On the XI Apex board?

  4. #4
    ROG Guru: White Belt Array Carlyle2020 PC Specs
    Carlyle2020 PC Specs
    MotherboardAsus Maximus XI APEX w/o vrm heatsink
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    It must be a wrong Bios setting since i get full speed on both SSDs.

    Confirmed via the tool you suggested.

    I checked my Bios. I didn't find something to point out except that "Hyper M.2 xxx" should be off since this is a pcie-slot extension card setting as far as i know.

    If you can't find the setting please post Bios pics and i will compare.

    Rgds
    Carlyle
    Last edited by Carlyle2020; Yesterday at 08:56 PM.

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