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    ROG Member Array vadimzuev90 PC Specs
    vadimzuev90 PC Specs
    MotherboardMaximus XI Hero (WiFi)
    Processori9 9900KF @5.1 GHz ⚡1.33V
    Memory (part number)F4-3600C16D-32GTRG
    Graphics Card #1MSI GTX 970 GAMING 4G
    Monitor2x Dell U2715H
    Storage #1Samsung 970 Pro NVMe M.2
    Storage #2Seagate ST2000DL001 2TB + Seagate ST32000646NS 2TB
    CPU CoolerROG Strix LC 360 RGB
    CaseROG Strix Helios
    Power SupplyROG Thor 850P
    Keyboard Logitech G910 Orion Spark
    Mouse Roccat Leadr
    Headset ROG Centurion 7.1
    Mouse Pad ROG Strix Edge
    Headset/Speakers Edifier R1280T
    OS Windows 10 Pro
    Network RouterROG Rapture GT‑AC2900
    Accessory #1 ROG Throne Qi
    vadimzuev90's Avatar
    Join Date
    Dec 2018

    Maximus XI Hero: struggling to get DRAM stable @ 3600

    Hi everyone, just as the title suggests I'm having some hard time with my DRAM and would like to ask the folks here for some advice.

    The main components in question (complete specs can be found in my profile) are a Maximus XI Hero (WiFi), an i9 9900KF and 2 sticks of G.Skill's TridentZ Royal memory (F4-3600C16D-32GTRG to be precise).
    BIOS version is 1401, dated 26 Nov 2019, I updated via Internet before tweaking any settings.

    After going through some trial an error I kept the following main settings for the CPU: core mult x51, cache mult x45, vCore 1.33V. As for the RAM, at first I went with the "XMP I" profile ("ASUS optimized") but I was getting code 55 on boot quite often, so I switched to "XMP II" (Intel default) which seemed more stable.
    Once into Windows, everything (including the DRAM @ 3600) looked OK, I ran a couple of hours of Prime95 in both CPU and RAM stress modes, as well as Cinebench, User Benchmark and HCI MemTest with up to 1000% coverage. Nothing crashed, nothing overheated.

    Weird thing about the DRAM @3600: the BIOS seems to always overwrite whatever I enter for DRAM, VCCIO and VCCSA voltages.
    When set to "Auto", I immediately get code 55 on boot, PC hangs for half a minute, then restarts and I get into UEFI seeing the following values entered into the input fields: DRAM 1.400V (actual 1.414), IO and SA both 1.35000V (actual 1.360).
    Lowering the voltages manually (even just a bit) results in multiple unsuccessful start attempts, then the system eventually boots into UEFI and I see the same stuff as above.
    Despite the obviously high voltages, I had no thermal issues, the temps seemed quite reasonable for the clocks, averaging 30°C idle, 45° gaming, 75° Cinebench and 85° Prime95.

    The real problem: with those settings I still randomly get codes like 55 and 32 as well as multiple unsuccessful start attempts on (re)boot, after which I get into UEFI, exit without changing anything and eventually it boots normally (sometimes AURA settings are reset). Very annoying stuff. As previously said, once I get into Windows everything is rock-solid, no issues after extended gaming and working sessions (I use Android Studio with multiple emulators, it produces considerable CPU / memory load). Lowering CPU clock seems to have no impact on the issue.

    My current solution: I set the DRAM to 3200 Mhz @ 1.35V, the rest to "Auto" which translated to 1.312V for VCCIO and 1.264V for VCCSA. Running those settings for several days, had no issues so far. Right now I only see 2 options:

    Option 1: Live with that

    • no more headache
    • possibly no significant performance penalty, except for benchmarks flagging the RAM as underperforming

    • knowing that G.Skill has some of the best DIMMs out there, can't avoid that bad feeling of not getting what I paid for

    Option 2 (suggested by a colleague): contact the vendor and try to get DIMMs replaced as "not working/unstable/whatever"

    • potentially this may work out

    • even more headache
    • the vendor might not agree
    • no guarantee that replacement DIMMs will be any better

    What are your thoughts guys, did I miss something? Thanks.

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