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  1. #1
    New ROGer Array
    Join Date
    Nov 2019

    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
    ProcessorCore i9 9900k @ 4.7GHZ (XMP)
    Memory (part number)CMD16GX4M4B3200C16-ROG
    Graphics Card #1Asus Strix GTX 1080 A8G
    Sound Cardon board
    MonitorASUS VG278HR & ASUS VK278Q
    Storage #1Samsung 960 Pro 512 GB & 970 EVO 2TB
    Storage #23X HGST 10TB, 1x HGST 4TB
    CPU CoolerScythe Mugen 5 PCGH
    CaseCooler Master Cosmos II
    Power SupplyCorsair AX860i
    Keyboard Corsair k95 RGB Platinum
    Mouse Corsair M65Pro RGB
    Headset Corsair Voide Wireless SE
    Mouse Pad Corsair MM300
    Headset/Speakers Logitech Z-906
    OS Windows 10 Pro x64
    Network RouterNetgear XR500
    Accessory #1 Xbox One Elite Wireless Controller
    Accessory #2 2X Corsair LL140, 4x Corsair LL120
    Accessory #3 1x Corsair LED RGB Pro expansion kit
    Ch3vr0n's Avatar
    Join Date
    Nov 2012

    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
    Join Date
    Nov 2019

    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
    Memory (part number)Corsair LPX 4000 CL19@17.21.41/560/2T
    Graphics Card #1OOO RTX 2080 Ti FTW3 ULTRA
    Graphics Card #2GTX 1060
    Sound CardOOO Xonar STX modified
    Monitor21: 9 LG 34 inch / flat
    Storage #11TB 960evo
    Storage #22TB 970evo plus
    CPU CoolerNoctua NH-D15
    CaseSilverstone FT2 +200 bucks of sounddampening
    Power SupplySeasonic TX-850 RMAed the prime tita1000w
    Keyboard Cherry KC 1000 / OOO CORSAIR K63 + lapboard
    Mouse MX Master 2S
    Headset Sennheiser PC360 + Philips X2HR
    Headset/Speakers klipsch 4.1 pc speaker /cooling modified
    OS Win 10 64bit
    Network Routeryeah right...
    Accessory #1 Silverstone EBA01 headphone stand / black
    Accessory #2 radio Keyfob to turn on and off from Garage
    Accessory #3 Adata USB3.1 512Mb SSD @480Mb ul/dl

    Join Date
    Mar 2018

    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.

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

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