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  1. #1
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    Z790 Hero + 13900K - Mobo Red Led On while stress testing (high temps)

    Hello guys,

    Got a question I cannot find an answer for. I have a 13900K paired with a Z790 ROG Hero. While running stress tests (specifically, CPU stress test from OCCT), the red led from the mobo, just below the small number indicator on the top right corner, lights up. It gets immediately removed when I stop the tests. Is this light normal to be up when the temps rise so much? We are talking around 98ºC on the CPU Package, and effectively thermal throttling.

    My BIOS version is the last one published on ASUS site, the 0703.

    Thanks in advance for any insight on this

  2. #2
    Moderator Array world PC Specs
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    Hey Dread

    It looks like based on the manual the red LED is the CPU Q-LED indicator, which suggests something CPU-related is throwing an error.

    Is there an error code also on the small display when the LED is lit?


    Click image for larger version. 

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  3. #3
    ROG Guru: Orange Belt Array JohnAb PC Specs
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    I don't know, but it seems likely that it is being used a CPU temp warning or throttling indicator. I would have thought it would be documented somewhere though (maybe in the BIOS manual perhaps?). If it's just the LED and no other issues, then I suspect it's nothing to be worried about, but if you get the answer, please advise.
    Last edited by JohnAb; 11-10-2022 at 01:27 AM.
    Z690 Hero, BIOS 2204, ME Firmware 16.1.25.2020, Corsair 7000X Case, i9 12900K, ASUS TUF OC 3090TI, 2 x 16GB Corsair RAM @ 5200MHz, Windows 11 Pro 22H2, Corsair H150i AIO Cooler, 4x Corsair RGB case fans, 3x M.2 NVME drives on motherboard, 2x SATA SSDs, 2x SATA HDs, 2x 4K monitors.
    "If you're lazy like me and do nothing else in life, be nice to yourself and back up your data today"

  4. #4
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    Quote Originally Posted by world View Post
    Hey Dread

    It looks like based on the manual the red LED is the CPU Q-LED indicator, which suggests something CPU-related is throwing an error.

    Is there an error code also on the small display when the LED is lit?


    Click image for larger version. 

Name:	z790 q-led.png 
Views:	0 
Size:	194.4 KB 
ID:	96149
    Indeed that's what the manual says, but this is happening while I'm already in Windows doing stuff (stress tests to be precise), so that description is not accurate for this situation.

    Hopefully someone can let us know more, this has never happened to me before to be honest.

    @JohnAb that's what I think, that the CPU is throttling and the mobo indicates it, but I would like some sort of confirmation from ASUS or someone with the knowledge to let us know more.
    Last edited by Dread13; 11-10-2022 at 07:47 AM.

  5. #5
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    Quote Originally Posted by Dread13 View Post
    that's what I think, that the CPU is throttling and the mobo indicates it
    Yes, this is exactly what is happening.

    This setting is enabled by default in the BIOS.

    In the Menu "Monitor", the last setting is called "CPU Temperature LED Switch". The description says "The CPU_LED will light up to indicate high CPU temperature".
    So if your CPU gets "too hot", the LED will light up. Be aware that with the newest BIOS versions (701 and above) the throttling already happens below 90°C. To disable it, you need to enable MCE (Multi Core enhancement).

  6. #6
    Moderator Array world PC Specs
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    Quote Originally Posted by MovedPermanently View Post
    Yes, this is exactly what is happening.

    This setting is enabled by default in the BIOS.

    In the Menu "Monitor", the last setting is called "CPU Temperature LED Switch". The description says "The CPU_LED will light up to indicate high CPU temperature".
    So if your CPU gets "too hot", the LED will light up. Be aware that with the newest BIOS versions (701 and above) the throttling already happens below 90°C. To disable it, you need to enable MCE (Multi Core enhancement).

    Great info-- thanks!

    I found what you're talking about in the BIOS manual:

    Click image for larger version. 

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    Click image for larger version. 

Name:	z790 cpu temp LED.png 
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ID:	96156

  7. #7
    ROG Guru: Orange Belt Array JohnAb PC Specs
    JohnAb PC Specs
    Laptop (Model)HP 430 G5
    MotherboardASUS Maximus Z690 Hero
    Processor12900K
    Memory (part number)2x 16GB CMK32GX5M2B5200C40
    Graphics Card #1ASUS RTX 3090 TI 24GB TUF GAMING OC - TUF-RTX3090TI-O24G-GAMING
    Monitor28" Samsung 4K & 32" Samsung 4K
    Storage #13x NVME Drives on Motherboard
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    CPU CoolerCorsair iCUE H150i ELITE LCD Display 360mm RGB Liquid CPU Cooler
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    Power SupplyCorsair RM1000x
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    That's great, good to know for sure
    Z690 Hero, BIOS 2204, ME Firmware 16.1.25.2020, Corsair 7000X Case, i9 12900K, ASUS TUF OC 3090TI, 2 x 16GB Corsair RAM @ 5200MHz, Windows 11 Pro 22H2, Corsair H150i AIO Cooler, 4x Corsair RGB case fans, 3x M.2 NVME drives on motherboard, 2x SATA SSDs, 2x SATA HDs, 2x 4K monitors.
    "If you're lazy like me and do nothing else in life, be nice to yourself and back up your data today"

  8. #8
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    Great to know, thanks a lot for the info Moved!!!

  9. #9
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    Also happens while gaming is it normal?*
    z790 maximus hero
    13900k intel
    4090 geforce
    tforce 7200 ddr5

  10. #10
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    Quote Originally Posted by MovedPermanently View Post
    Yes, this is exactly what is happening.

    This setting is enabled by default in the BIOS.

    In the Menu "Monitor", the last setting is called "CPU Temperature LED Switch". The description says "The CPU_LED will light up to indicate high CPU temperature".
    So if your CPU gets "too hot", the LED will light up. Be aware that with the newest BIOS versions (701 and above) the throttling already happens below 90°C. To disable it, you need to enable MCE (Multi Core enhancement).
    But MCE isn’t sort of an overclock? Wouldn’t it make the heating worst?

    Just tried gaming with MCE turned off, cpu still overheats.*
    Last edited by GuzMonster; 11-15-2022 at 02:24 PM.
    z790 maximus hero
    13900k intel
    4090 geforce
    tforce 7200 ddr5

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