Fans forced to 100% when CPU reaches 75C

[TamiyaGuy]

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.

[tautomer]

I have a Crosshair VII Hero WIFI paired with a 3800X. This issue bothers me a lot.
Ryzen 3000 is known for the hotness. Die temperature goes around 60 or 70 very easily.
For now, I set motherboard as the temerpautre source for all my chasis fans. Since motherboard temperature is almost a constant, these fans will pretty much stay a constant RPM, which is good enough for providing some airflow. Right now only the CPU fan will ramp up, but it's acceptable.

ASUS really need to fix this issue. This limit is totally unnecessary for something labeled 'R O G'.

[bass_junkie_xl]

tautomer wrote:
I have a Crosshair VII Hero WIFI paired with a 3800X. This issue bothers me a lot.
Ryzen 3000 is known for the hotness. Die temperature goes around 60 or 70 very easily.
For now, I set motherboard as the temerpautre source for all my chasis fans. Since motherboard temperature is almost a constant, these fans will pretty much stay a constant RPM, which is good enough for providing some airflow. Right now only the CPU fan will ramp up, but it's acceptable.

ASUS really need to fix this issue. This limit is totally unnecessary for something labeled 'R O G'.

i guess this works kinda ish as a work around . i delided my 9900 ks and relided it with rockit cool ihs . i now am 5 ghz / 4.7 cache on 16 threads with ram @ 4200 mhz and my cpu on one core hits a max temp of 65 - 68 c on one core in battlefield 5 with 100 % cpu usage . other games im 60 c and under .

[Ninjastrike]

Sorry about the necro, but I FINALLY found a way to get around this issue entirely, just from BIOS. I have 2 corsair ML140s on the top of my case that would go full blast whenever my ryzen 2700X hit 75/76 C, and I've spent hours of frustration trying to find a way to fix this. I'm not willing to go the AI suite route because that software has issues with custom fan profiles and just isn't an option for me.

Anyway, here's my BIOS only solution that actually works:

• Go to the Monitor tab
  
• Go to the Qfan option at the bottom
  
• Navigate to the desired fan that you want adjusted
  
• Under "Temperature Source, select Motherboard from the dropdown.
  

This makes the fans stop paying attention to the CPU temperature, and only respond to the temperature sensor on the motherboard itself which is entirely independent from the CPU and will almost always exhibit lower temps.
Now, my case fans will theoretically go max only when the motherboard temp sensor reaches 75 C, which on my Strix x470 never actually happens (for example, I'm idling at 30 C for motherboard right now). I'm not sure if this works with the CPU fan, but for case fans it's a functional workaround (at least on my motherboard, no guarantee on the x570 ones since those chipsets do tend to run hotter and might actually reach 75 C)

This isn't a perfect solution, and a BIOS update from ASUS would be way better, but until then this will at least stop the problem from happening in some cases. The main issue with this workaround is that FAN CURVES WILL NOT WORK. Because the fan control is now pulling data from somewhere that is not the CPU, if you have fan curves, they will be entirely ignoring the CPU temperature, and just going by the alternate reading from the motherboard instead. This isn't a big deal for case fans, which you can just set to manual, use whatever power percentage best balances your airflow, and forget them, but for a CPU cooler this would be a large issue, unless you want to set it at a constant speed. Because of this I DO NOT RECOMMEND using this approach with a CPU cooler.

Anyway, I hope this helps. ASUS, pleeeease fix this!

[monkeyface]

This is simply ridiculous! ASUS, please give us control of our own fans. Or at least consider raising your hard limit to something more sensible for modern CPUs, like 80-85°C.
Are the latest X570 boards also limited to 75°C?

EDIT: All right, I just upgraded the BIOS of my ROG STRIX X470-F from July 2020 to Jan 2021, and the issue is now fixed! Fan curves are configurable all the way up to 100°C - awesome. Thanks, ASUS! 😄

[vvoid]

Lol, this thread is still alive, still no response from Asus, and this is over multiple generations of boards, so sad.

Anyway, in your case, just use another Temp source for the pump. That's the way I deal with it (setting all sources to something else than CPU temp), only CPU remains which cannot be changed. So for that I'm using a Noctua low noise adapter for the fan, so that it never reaches its max rpm and remains acceptable, even during those burts.

It's just ridiculous Asus doesn't do anything about it. I can understand why this would be a reason to turn away from Asus motherboards. Depending on one's setup/needs it is very annoying.