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CPU Fan Noise



 I have a windows 10 desktop PC with asus TUF Z270 MARK 2 motherboard with Intel i3-7100 CPU & 12GB of RAM.

 The CPU fan makes constant humming noise and I can deal with it. However whenever I open an application such as internet browser, WORD, EXCEL, Outlook  or anything that spikes the CPU utilization percentage, the noise level goes up. 

The noise level comes down eventually to a certain level after files are open (after dust settles, so to speak), but then if I keep multiple applications open at the same time, the sound goes up and down constantly on its own.

It is really annoying.

Is there anything that I can "DISABLE" in BIOS or should I simply replace the CPU fan which seems to be the source of the noise?


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Scott Silva
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Replace the fan, as disabling it will overheat things and be even MORE annoying as the PC shuts down...
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Clean off all the dust, not just from the fan & Heatsink, but from the complete PC. Then remove the Heatsink (with the fan) from the CPU, & and clean both the CPU's & Heatsink's surface from any Thermal transfer paste. Best use Alcohol for that. After that add a very small drop of fresh Thermal transfer paste to the middle of the CPU & firmly reattach the Heatsink.
If after that you still have issues, check the BIOS settings, you may have options there to regulate how the fan should run, at what speeds for what Temperatures etc.

Looking at the amount and consistency of the dust I bet the sleeve bearing is just failing on the fan... They do not last forever.

I agree with Scott, they are not expensive and your better off replacing then hoping it doesn't just stop and damage the CPU when it overheats. 
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When I am looking for a replacement, what is it that need to remember as far as the size or shape?
Can you recommend a quiet fan on
Although I agree that the Heatsinks with fans are cheap & can easily be replaced, I don't agree that this has to be a "Fan" malfunction. The fact that the fan's speed changes with higher loads on the CPU actually points to the fan working as it should. But the dust clogging the Fan & Heatsink, & possibly old, dried up thermal transfer paste, suggests that the heat builds up sooner than normal, & so the fan's speed changes quicker than normal resulting in more noise, & particularly constant revolution adjustments, so the noise isn't constant. A thorough cleanup & also looking at possible BIOS setting changes should really help most.
Well I assumed when the OP said "noise" they meant abnormal noise, not just fan speeding up which isn't that loud...

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I just cleaned the CPU fan with electronic duster, but it made no difference whatsoever.
I like to replace the fan. Can you recommend a quite one?
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Let me clarify the noise pattern.
The level of noise goes up in a higher pitch as CPU spikes which occurs as I open application programs like Outlook, Word, Chrome ... etc. When CPU utilization % returnes to below 20%, there is that constant humming noise.
If I open WORD, for example, it spikes to 70% and noise level increases momentarily but then it returns to normal in several seconds.
So I think CPU fan is in working order.
I  think this fan is just a loud one. 
Did you clean entire PC or just the fan?
There can be 2 or more fans in a PC... And dust in any area could trigger temp warnings that increase fan speed...
If fan is roughly at the same noise level that it has always been, then it is working as it should...
You might be able to find a quieter fan, but many newer OEM PC's have the fans reporting their speeds to the I/O system and are speed controlled based on thermal readings... So you can't just use ANY fan...
As for what works with yours. I would see if the manufacturers website shows any parts availability...

Basically changing the Fan won't change how it reacts to temperature changes. When the CPU's Temperature rises, the Fan will run faster, & when the Temperature drops, so will the Fan speed.

Besides that, you won't just change the Fan. You need to get the Fan with a Heatsink, they are always a set. If you get something new, then you should look at the volume of the Heatsink, & what material it is made of. The more volume (larger) it has, the better is it's heat dissipation. Copper also conducts heat better that Aluminum, but it is also much more expensive... Another criteria that should be considered is the Size & Diameter of the Fan. The bigger the diameter, & the larger the fan blades, the slower it can rotate with the same air movement as smaller fans. The slower they rotate, the less noisy they are, & also, because they run slower, the dust won't accumulate as fast. So when you get a new Fan/Heatsink set, look at the size of both. But also make sure it would fit into your PC. Many PC's aren't built for large Fan & Heatsink sizes, & often, if they can accommodate for those, you may need to change the mounts for them, which requires you to remove the complete Mainboard to make those adjustments. For example the standard Fan/Heatsink you currently have, uses a clip-mount system. Bigger systems, because they are larger & heavier, need to be screwed on. To be able to do that, you usually have to mount a plate with screw holes under the mainboard. If you buy a new set, make sure it is compatible with your CPU Socket.
Disabling Fan == CPU Destruction

Fans spin up because cooling is required to allow CPU to function without being destroyed.

Clean fan + also look at task manager to shutdown all non-essential processes, which can dramatically reduce CPU usage + heat.

Also, if there's a mechanical disk in the system change it out for an SSD drive, as mechanical disks run hot.

Also if there's a CD/DVD player, pull the power connecter on this device to also dramatically reduce heat.
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The computer does not have CD/DVD player, but has a SSD.
It has a regular PS, auxiliary fan and CPU fan - a very typical setup.
When I unplugged the power cable (from auxiliary fan) from the mobo, the computer won't start and I found this interesting.
I had disabled all non-essential services from MSCONFIG before posting this question.
When I buy new desktop PCs these days, they are so quite and somtimes you wonder if the computer is turned on or not.
This computer, I would say probably > 5 yhears old) happens to be the loudest that I have encountered in recent years.
If you're already running SSD with no CD/DVD, then you're running as cool as you can get.

Best to clean your fan thoroughly.

You can pickup cans of compressed air pretty much anywhere.

Likely even Amazon sells these.

You might have to replace the fan.

Just do this carefully as some fans are... attached oddly...

From the image you attached, looks like this fan should be easy to replace, so if the fan bearing is making any noise + you can get a replacement fan, likely good to do a replacement.
you can use speedfan to monitor the temps, or open hardware monitor
Open Hardware Monitor - Core temp, fan speed and voltages in a free software gadget 
use it before changing anything, and make a note of the values

>>  happens to be the loudest that I have encountered in recent years.   <<  you seem to have quite a bit of dust there, so i suggest cleaning the whole PC thoroughly, and especially also the POWER SUPPLY.
i use an old hoover(1980's) that sucks and blows, but you can still find such :  The Vacuum That Has Suction and Blowing Function in One Machine | RIDGID Tools 

also look if the ps HAS A 9 CM OR 12 CM FAN - the 12 cm fan is nearly inaudible, while the 9cm ones create much more noise (running much faster)
and when everything is clean - follow rindi's advice and replace the heat paste
then ch"eck the temps values again
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Just to be clear, I cleaned the CPU fan using Compressed Air Duster.
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