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  1. #1
    New ROGer Array LiKenun PC Specs
    LiKenun PC Specs
    MotherboardASUS ROG CROSSHAIR X670E EXTREME
    ProcessorAMD Ryzen 9 7950X
    Memory (part number)Kingston KSM48E40BD8KM-32HM
    Storage #1Intel Optane SSD 905P Series 380GB
    CPU CoolerNoctua NH-D12L
    CaseSilverStone RM42-502
    Power SupplyCORSAIR AX1600i Digital ATX Power Supply

    Join Date
    Nov 2022
    Reputation
    21
    Posts
    9

    Question DDR5 ECC UDIMMs with CROSSHAIR X670E EXTREME and Ryzen 9 7950X?

    The official specs says that CROSSHAIR X670E EXTREME supports ECC memory and so does Ryzen 9 7950X. It took a while to find a vendor with DDR5 ECC UDIMMs in stock, but I finally got the Kingston Server Premier DDR5 4800MT/s ECC UDIMMs last week and the system I put together last night doesn’t work.

    Relevant parts of the build:

    Component Product
    Motherboard ASUS ROG CROSSHAIR X670E EXTREME
    Processor AMD Ryzen 9 7950X
    RAM Kingston Server Premier DDR5 4800MT/s ECC UDIMM
    Power supply CORSAIR AX1600i Digital ATX Power Supply

    With peripherals connected, I observed the following:

    • No display output, although the USB-C-to-HDMI dongle LED is on.
    • USB optical mouse laser is off (no power).
    • USB keyboard LEDs are off (no power).
    • Front panel USB-C port can charge my phone.

    Q-Codes observed during startup with the DIMMs in slots A2, B2, A2 + B2, or all the slots:
    Q-Code Meaning Duration
    00 Not used Split second
    C1 (unknown; not in MB documentation’s Q-Code table) Split second
    46 (unknown; not in MB documentation’s Q-Code table) Split second
    91 Driver connecting is started Split second
    00 Not used Split second
    15 Pre-memory System Agent initialization is started 60 seconds
    00 Not used Split second
    CC (unknown; not in MB documentation’s Q-Code table) Split second
    00 Not used Split second
    00 Not used Split second
    99 Super IO initialization Final state (forever)

    I checked ASUS’ general troubleshooting page (Intel-specific rows removed):
    AMD Motherboard Q-Codes CPU abnormal Memory abnormal Graphic Card abnormal Others abnormal
    F9 ✔️
    B0, 99, 15, 53 ✔️ ✔️
    D6 ✔️
    00, 19, 30, 40, 55 ✔️ ✔️ ✔️
    A0, A2 Boot up device abnormal
    B2 External device abnormal
    A9 Boot into the BIOS
    AA Boot into the system

    It seems like I should focus on either CPU or memory.

    I’ve already attempted these troubleshooting steps:
    Component Action Result
    PSU Connect all the connectors. Already double-checked that they were all connected.
    CPU Check for dirt This what what I did before putting the CPU in.
    CPU Check for broken pins (not applicable to AM5 CPUs now, but applicable to the MD socket) I took the fan and heatsink off and removed the CPU to inspect the pins in motherboard CPU socket. They look fine to me.
    RAM Check for dirt Already vacuumed the motherboard and inspected the RAM modules themselves.
    RAM Try the different configurations. Slots A2 and B2 alone or together and all four slots exhibit the behavior I described. Using either slots A1 or B1, though, result in a Q-Code C5, which is not documented, but they also non-recommended memory configurations. And just for completeness, no RAM modules installed results in a near-instantaneous Q-Code of 10 (PEI Core is started).
    Peripherals Remove all peripherals. Already tried with and without.
    Clear the CMOS. No changes to symptoms.
    Switch BIOS (on dual-BIOS boards). No changes to symptoms.

    From Googling Q-Code 99-related issues, one commenter noted that it’s probably storage-related. But installing the PCIe 5.0 M.2 adapter (which comes with the motherboard) with a stick of memory didn’t change the outcome.


    I plan to substitute the RAM kit next. I already have a RAM kit on the motherboard’s QVL in my shopping cart (CORSAIR CMT32GX5M2B6000Z30K) which can ship in a few days and would still be within my RMA period. If that doesn’t work, I’m not sure what to do.


    If RAM incompatibility is the real problem, is there any expectation of RAM support being expanded with new BIOS updates? There is a post about a similar issue on a different forum and about different motherboard manufacturer, but it mentions that:
    I had to update the BIOS from 1.03 to 1.09 for it to POST with the new RAM.

    Edit: added BIOS note
    Last edited by LiKenun; 11-13-2022 at 10:14 PM. Reason: Add relevant link to similar problem

  2. #2
    New ROGer Array LiKenun PC Specs
    LiKenun PC Specs
    MotherboardASUS ROG CROSSHAIR X670E EXTREME
    ProcessorAMD Ryzen 9 7950X
    Memory (part number)Kingston KSM48E40BD8KM-32HM
    Storage #1Intel Optane SSD 905P Series 380GB
    CPU CoolerNoctua NH-D12L
    CaseSilverStone RM42-502
    Power SupplyCORSAIR AX1600i Digital ATX Power Supply

    Join Date
    Nov 2022
    Reputation
    21
    Posts
    9

    Initial Problem Fixed

    Now I am able to get the board to start and the USB4 port to output something. I can see the hardware properties in the UEFI BIOS. The fix was not obvious to me but I had to flash the board with the latest BIOS update. Thanks to a kind stranger for suggesting it.

    This was not a PSU, CPU, nor RAM problem, but a MB BIOS problem.
    Last edited by LiKenun; 11-14-2022 at 01:48 AM. Reason: Thanks

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