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  1. #1
    New ROGer Array
    Join Date
    May 2018

    Question CPU and case fans mysteriously stopping on the ASUS Prime X470-Pro


    I've been having an odd issue involving my case and CPU fans completely stopping for no reason for around 2-3 weeks now, forcing me to reboot to fix the issue. I've not found a cause for this, it seems completely random. Sometimes it spares me for a few days, sometimes it happens multiple times per day. On two occasions instead of stopping, the fans got stuck at around 300 RPM and 600RPM, regardless of load.

    I did some searching to see if anyone else was experiencing something like this and found that there's been a few others experiencing the same issue on different ASUS boards -

    There's at least two notable posts explaining why this might be happening -

    "The Super IO chip does not like multiple apps accessing it. This can cause PWM issues. For example if I have HWINFO monitoring a stress test and then open CPU-Z it can cause an issue with Super IO chip. The "corruption" may not exhibit PWM issue for x period for that post but it will occur in my testing. If I repost after multiple apps have accessed Super IO chip there will be on issue. Programs like AIDA64, CPU-Z, can still be accessing Super IO chip in background even when not on relevant screen of app."
    "I am finding that the ITE IT8665E eventually malfunctions over time due to monitoring software and I have to reboot to correct"

    Each time it's happened, the only monitoring software I've had running was HWinfo64. I unfortunately can't do without it since I rely on it alerting me when the CPU temps skyrocket due to the fans stopping. I'm worried that if I don't have it open at all times, the fans might still stop due to some other reason and I won't be aware of it, causing the poor thing to run at 95-100C for hours on end.

    Some system info;

    Motherboard: ASUS Prime X470-Pro
    CPU: R5 2600X
    CPU Cooler: Be Quiet! Dark Rock 4
    Case fans: 3x Be Quiet! Pure Wings 2 120MM DC fans - these were working fine for 3-4 years in my old build, never had a problem
    UEFI version: Updated to 4011
    OS: W10 Home

    So.. What do I do? Can this be fixed in a future BIOS update?

    I'd very much appreciate any thoughts or advice on what I could try. I'd really be quite saddened if I had to deal with this issue for the next 5-6 years.

  2. #2
    ROG Guru: Brown Belt Array davemon50 PC Specs
    davemon50 PC Specs
    Laptop (Model)Asus G752VY-DH72 (17") and Asus G752VT-DH74 (17")
    MotherboardAsus ROG LGA2011-v3 Rampage V Edition 10, x99 EATX
    ProcessorIntel Core i7-6950X Extreme 10-core 25MB Cache 3.0 GHz
    Memory (part number)Corsair Vengeance LPX Red DDR4 DRAM 64GB-4x16 3333 (CMK64GX4M4B3333C16R)
    Graphics Card #1Sapphire Nitro Radeon R9 Fury 4GB HBM Backplate
    Graphics Card #2Sapphire Nitro Radeon R9 Fury 4GB HBM Backplate
    Sound CardAsus SupremeFX Hi-Fi Audio DAC
    Monitor(2) Dell UltraSharp U2515H 25-inch monitors
    Storage #1(4) SSD's - Samsung 960 & 970 1TB M.2, Intel 535 480G, Intel 510 250G
    Storage #2(3) HDD's - Western Digital Caviar Black 2TB 3.5-in SATA III 64MB Cache
    CPU CoolerCorsair Hydro Series H80
    CaseCorsair Obsidian Series 650D Black, ATX, Mid Tower
    Power SupplyCorsair Digital AXi-Series AX1200i (1200W) 80+ Platinum Rating
    Keyboard Logitech Wireless K360
    Mouse Logitech Wireless MX Anywhere 2
    Headset HyperX Cloud II
    OS Windows 10 Pro 64-Bit
    davemon50's Avatar
    Join Date
    Apr 2017

    Fans should have a lower limit. Once you get below that they might not be getting enough power to spin I'm thinking. 300 rpm is quite low.

  3. #3
    New ROGer Array
    Join Date
    May 2018

    Yup, I've got lower limits set. 50% for the CPU, 40% for the case fans. This usually has them hovering around 600-700 RPM when idle. I haven't the slightest idea why they got stuck at around 300 RPM that one time. They weren't responsive to CPU load either, even though they should've ramped up to around 1,300 RPM under load.

  4. #4
    ROG Junior Member Array
    Join Date
    May 2018

    I had the same issue yesterday and scared by my cpu running on I-dont-know-how-long for 95-100°C I searched around the web a bit. Thats how I found this thread and some others also.
    The most important one I could find seems to be this one:
    This thread seems to confirm that is has nothing to do with the PSU or the fan's itself. Its as VIKTORIAH was suspecting most definitely a bug with the ITE IT8665E and how it reacts to getting polled a lot by software like hwinfo or aida. A variety of ASUS motherboards seem to have this issue, which makes it even harder to understand why it isnt fixed yet.
    I am also somewhat baffled by why the board doesnt seem to have any protection shutdown mechanism nor any temp warning / fan not running warning settings.

    My speccs:
    Motherboard: ASUS Prime X470-Pro
    CPU: R5 2600X
    CPU Cooler: Thermalright True Spirit 120 Direct with a Noctua NF-P12 redux-1300 PWM
    Case fans: 2x Thermalright 140MM PWM fans - I also used my fans in my old setup for some years now without any issue
    UEFI version: Updated to 4011
    OS: W10 Pro
    The cpu isnt overclocked besides the asus bios things that it came with out of the box (XFR etc) and is undervolted by -0.075V.

    When I had the issue yesterday the case fans stopped working and the cpu fan seemed to be locked at 10% RPM. When I finally noticed the error, my case was burning hot, the cpu ran like described on 98°+ Celsius and the cores already throttled down to 3,4 GHZ.
    Last edited by AgathoN667; 05-24-2018 at 05:02 PM.

  5. #5
    New ROGer Array cvlada PC Specs
    cvlada PC Specs
    Laptop (Model)OMEN X by HP 2S 15t-dg000 CTO
    MotherboardAsus ROG Crosshair VIII Formula
    ProcessorAMD Ryzen 9 5950X
    Memory (part number)G.Skill Trident Z RGB 64 GB (2 x 32 GB) DDR4-4000 CL18 (F4-4000C18D-64GTZR)
    Graphics Card #1MSI GeForce RTX 3080 10 GB VENTUS 3X OC
    MonitorSamsung Odyssey G7 LC32G75TQSNXZA
    Storage #1Samsung 980 Pro 500 GB
    Storage #2Samsung 870 QVO 2 TB
    CPU CoolerNZXT Kraken Z73
    CaseNZXT H710
    Power SupplyAsus ROG Strix 750
    Keyboard SteelSeries Apex Pro
    Mouse SteelSeries RIVAL 650
    Headset SteelSeries Arctis Pro Wireless
    OS Windows 10 64bit Pro

    Join Date
    Nov 2018

    I have this issue as well on the same motherboard. Did you manage to resolve this?

  6. #6
    New ROGer Array
    Join Date
    Oct 2019

    The same problem.
    Night render in 3dsmax begin successful. Processor load 100%, temperature 67 C, fans load ~90%
    After ~ an hour, the fans for some reason go into minimum mode, the processor overheats and the computer goes into reboot.

    Asus Prime X470-Pro
    Last UEFI
    12-Core AMD Ryzen 9 3900X, 4000 MHz (40 x 100)
    Noctua D15 AM4 (two fans)
    Memory 32683 МБ
    GeForce GTX 780 (3 ГБ)
    Power Supply Thermaltake 1200w
    Microsoft Windows 10 Pro for Workstations 10.0.18362.295 (Win10 RS6 [1903] May 2019 Update)
    Last edited by Alex.Ivanov; 10-25-2019 at 10:48 AM.

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