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  1. #1
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    Fans forced to 100% when CPU reaches 75C

    Been using a PRIME Z270-A, along with an i7 7700K, for a little while and I've got to say that as my first Asus product, I'm pretty disappointed. I've noticed that in both BIOS and AI Suite III fan control options, the fans attached to the motherboard force themselves to 100% speed when the CPU reaches 75 degrees Centigrade, and there doesn't seem to be any way to fix this. Having bought Asus specifically for their reputation in fan control options, and seeing other options like the "Extreme Quiet" PWM option and fan spin-up/spin-down time variation, this seems like a really strange limitation for two reasons:

    1) Competitors seem to offer much broader temperature control. MSI allows at least 85C, Asrock seems to allow 90C, and Gigabyte allows full control up to 100C. So why is Asus so behind the competition in this, especially in this day of both silent systems and easy overclocking?

    2) Intel themselves have said that a 7700K reaching 75 - 80C is "considered expected and normal". So why is Asus ramping up every fan in my system to 100% as if it's some kind of critical temperature?

    Is there any way to bypass this limit? I've tried both in the AI Suite III application and by modifying the saved profiles within the application folder, but neither seem to work.
    Last edited by TamiyaGuy; 06-04-2017 at 09:05 PM.

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  3. #3
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    Quote Originally Posted by Chino View Post
    You can control the fan curve in AI Suite III or the BIOS.
    Unfortuantely, I can't adjust them beyond 75C, either in the BIOS or AI Suite III. Please see the attached screenshots: I cannot move the far-right circle any more to the right, and any other attempts to change the fan speed don't work.

    Click image for larger version. 

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    Click image for larger version. 

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  4. #4
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    And the "CPU fan step up" and "CPU fan step down" settings in the bios are not workin

    Hi,

    I aquired a Strix Z270F myself, and been suprised by this limitation too, and I have to add that the "CPU fan step up" and "CPU fan step down" settings in the bios are not working (tried with DC and PWM fans).

    Can we expect a bios upgrade ?

  5. #5
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    Kramer Weston

    Quote Originally Posted by Aghoithae View Post
    Hi,

    I aquired a Strix Z270F myself, and been suprised by this limitation too, and I have to add that the "CPU fan step up" and "CPU fan step down" settings in the bios are not working (tried with DC and PWM fans).

    Can we expect a bios upgrade ?
    Well I have noticed that while the BIOS seems utterly limited to 75C (entering anything more than that in the "[Fan] Critical Temperature" field found in the advanced Q-Fan menu results in an error message and being reset to 75C) the latest version of AI Suite III does allow you to set a custom critical temperature above 75C for case fans. For some strange reason you can't do the same for the CPU fan, but I suppose it's better than nothing. Helps keep my 1500rpm case fans at bay, at the very least.

  6. #6
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    I really wish we could have this limit raised to 85-90C seeing as 7700k can easily spike to 85C under heavy load without any OC at all.
    That makes the fans go totally crazy..

  7. #7
    ROG Enthusiast Array Dude1070 PC Specs
    Dude1070 PC Specs
    MotherboardTUF Z270 MARK 1
    Processori7-7700K
    Memory (part number)16 GB G.SKILL TRIDENT Z 3600 F4-3600C15D-16GTZ
    Graphics Card #1MSI GAMING X GTX 1080 Ti
    Sound CardStrix Soar
    MonitorASUS V32AQ (2560X1440) DELL S2309W (1920x1080)
    Storage #1Samsung SSD 960 EVO 250GB
    Storage #2SAMSUNG SSD EVO 850 500GB
    CPU CoolerNoctua DH 15
    CaseZalman H1
    Power SupplyEVGA Supernova 850GS
    Keyboard Logitech G510s
    Mouse Logitech G502 Proteus Spectrum
    Headset Cerberus V2
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    OS W10 Pro X64
    Dude1070's Avatar
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    Did you guys use the Fan tuning option in the BIOS or AI Suite? That opens it up for settings.

  8. #8
    ROG Member Array FaaR PC Specs
    FaaR PC Specs
    MotherboardASUS ROG Strix X299-XE Gaming
    ProcessorIntel Core i9-7900X
    Memory (part number)G.Skill TridentZ RGB F4-3600C16Q-32GTZR (64GB)
    Graphics Card #1ASUS Radeon R9 390X DC2 8GB
    Graphics Card #2ASUS Radeon R9 390X DC2 8GB
    MonitorSamsung SyncMaster SA850
    Storage #1Samsung 960 Evo M.2
    CPU CoolerNoctua NH-U14S
    CaseFractal Design Define C TG
    Power SupplyCorsair RM1000i
    Keyboard Corsair Vengeance K70
    Mouse Logitech G700s
    OS Windows 10 Pro

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    Quote Originally Posted by Dude1070 View Post
    Did you guys use the Fan tuning option in the BIOS or AI Suite? That opens it up for settings.
    Yes, but you still can't change or exceed the 75C "critical" temp on the CPU fan headers. That's the whole point of this thread!
    Last edited by FaaR; 10-14-2017 at 03:23 PM. Reason: Clarification...

  9. #9
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    Quote Originally Posted by FaaR View Post
    Yes, but you still can't change or exceed the 75C "critical" temp on the CPU fan headers. That's the whole point of this thread!
    yes its very annoying when pump and fans going up and down, up and down when i have 75C or more on CPU

  10. #10
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    The title of this thread is a bit wrong as fans are not forced to 100% depending on settings but I'm here to also complain about the 75°C limit as this prevent my build to remain silent when I overclock a bit more but because I really wanted a silent system and that performance wasn't a top priority I lowered like 200MHz so it never reach that 75°C limit.

    One reason could be it's because it's reading Tcase and not Tjunction? If it was based on Tjunction, upper fans settings would kick in well before.

    Where is Raja? I'd like to hear from ASUS if there is a chance that this limit will be upped a bit in the near future. Personnaly I would be happy with 85°C.

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