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  1. #1
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    ASUS ROG STRIX X399-E GAMING BIOS for Resizable BAR

    Does this chipset support the Resizable BAR feature? I see that it has the 4G Decoding feature.

    -Erick

  2. #2
    ROG Guru: Yellow Belt Array Dimitrios1971 PC Specs
    Dimitrios1971 PC Specs
    Laptop (Model)GX700VO 1TB SSD + 64GB RAM
    MotherboardASUS ROG ZENITH EXTREME ALPHA
    ProcessorAMD Ryzen Threadripper 2950X
    Memory (part number)F4-4000C18Q2-64TZR (3333MHz)
    Graphics Card #1ROG Strix GeForce® GTX 1080 Ti OC-Edition
    MonitorROG Swift PG348Q Gaming
    Storage #14 x Samsung SSD NVMe 960 PRO 1TB Raid0
    Storage #24 x Samsung SSD NVMe 970 PRO 1TB Raid0
    CPU CoolerCOOLER MASTER MasterLiquid ML360 RGB TR4 Edition
    CaseROG Strix Helios
    Power SupplyASUS ROG THOR 1200P
    Keyboard ROG Strix Scope Deluxe & ROG Strix Scope TKL Deluxe
    Mouse 2 x ROG Chakram
    Headset ROG Throne Qi
    Mouse Pad ROG Balteus Qi RGB & ROG Sheath
    Headset/Speakers 1 x ROG Strix Go 2.4 & ROG Strix Wireless
    OS Win10_x64
    Network RouterFRITZ!Box 6660 Cable
    Accessory #1 BW-16D1H-U PRO
    Accessory #2 ROG STRIX ARION & Asustor AS6404T
    Accessory #3 2 x HYPER M.2 X16 GEN 4 CARD
    Dimitrios1971's Avatar
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    Well ... I ask myself too!

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  3. #3
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    I think DirectStorage's requirement will be the large memory support from BAR. One can only hope.

  4. #4
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    BIOS Adjustments for X399 exceeding BAR's performance.

    After some testing, I used HWINFO only to discover that BAR is actually enabled on my RTX 2060 Super 8GB and 64 GB of memory at 2800 MHz (3200 MHz actually, but it will not boot) with this motherboard. Ialso use a Threadripper 1920X and 4TB NVMe RAID.

    I dove further into the BIOS to learn that some settings left at AUTO does not mean they are actually enabled, so I have decided to enable some Zen options and build this with NVMe over RAID. I have a reason to believe that Zen already have BAR like behavior by allowing the GPU to use areas that are normally used by hypervisors.

    Before using these settings, a game like Godfall was stuttering heavily, which led to gamers not wanting to play it on the PC. After enabling these settings, the X399 somehow uses the GPU far more efficiently when gaming in a BAR like behavior. This YouTube video that I have explains it when I tested Godfall and Horizon Zero Dawn for Steam/PC. https://youtu.be/HVa8OmYMEms

    Below are the settings that I enabled in BIOS:

    The System must use RAID as RAID does not neet to share or wait for a transfer.


    Advanced
    -SATA Configuration
    SATA Mode=RAID The CSM Support Module must be set to disabled in order to use the hardware RAIDXpert Utility, and all devices must have a 64-bit driver.


    -Onboard Devices Configuration
    CPU PCIE Link Mode=GEN3
    SB PCIE Link Mode=GEN2

    -PCI Subsystem Settings
    Above 4G Decoding=Enabled
    SR-IOV Support=Enabled Note: The RTX 20 Series have BAR enabled according to HWINFO despite the lack of advertisement.


    -AMD CBS
    Zen Common Options
    L2 TLB Associativity=1 Note: 1 is for 4K only. (Currently testing)
    Opcache Control=Enabled
    SEV-ES ASID Space Limit=9
    Streaming Stores Control=Enabled
    Prefetcher Settings
    L1 Stream HW Prefetcher=Enable
    L2 Stream HW Prefetcher=Enable


    DF Common Options
    Memory Interleaving=Channel Note: If other than AUTO, this fabric level memory interleaving must meet the requirements, else it will be ignored.


    UMC Common Options
    DDR4 Common Options
    PHY Configuration
    PMU Training
    DFE Read Training=Enable
    FFE Write Training=Enable
    PMU Pattern Bits Control=Auto
    Common RAS
    ECC Configuration
    DRAM ECC Symbol Size=8x
    DRAM ECC Enable=Enabled

    NBIO Common Options
    NB Configuration
    IOMMU=Enabled
    PCIe ARI Support=Enable


    NTB Common Options
    NTB Enable=Enabled
    NTB Mode=Auto
    Link Speed=Max Speed

    -AMD CBS
    MMIO Above 4G Limit=44 Note: Default is 39
    Enumerate all IOMMU in IVRS=Enabled
    NVME RAID Mode=Enabled
    Last edited by Gamelounge78; 06-07-2021 at 12:42 PM. Reason: Formatting Issues

  5. #5
    New ROGer Array KraZy_SkitZy PC Specs
    KraZy_SkitZy PC Specs
    Laptop (Model)Gt80s 6qe
    MotherboardZenith Extreme x399
    Processor2950x
    Graphics Card #1Asus tuf 6900 xt
    Storage #1Samsung 970 evo 512gb
    Storage #2Adata s11 2tb

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    Seems silly asus won't support the x399 with the simple task of enabling us to use resizeable bar, when msi, an ASRock have. Buddh of mine is running resizeable bar with a 6800xy on a x399 Taichi problem free an a nice performance boost on some of the games he plays. These were expensive boards, I don't think it's unreasonable to ask for asus to offe a little support on the enthusiast platform that isn't that old. I guess they no longer want my money. Never considered asrock till now.

  6. #6
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    BIOS Update, But NO SAM

    There was a new BIOS update to meet Windows 11's requirement, but alas no SAM by hadware. I wonder if this could be implemented in Windows by the driver.

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