I've just answered this somewhere else. Try the settings below. 25C/40 60C/50 65C/80 70C/100 What this does is that, at lower temps, the fans will not ramp up as fast or as intensely, and it will only ramp up upon actual use. There's probably also a ramp up and ramp down speed adjustment. Set it to the highest you can find. Should be 0.7s and 1.0s respectively. Answer from KohGeek on reddit.com
Quora
quora.com › My-CPU-fan-seem-to-be-spinning-at-inconsistent-speeds-And-performance-issues-had-started-ever-since-How-do-I-fix-that
My CPU fan seem to be spinning at inconsistent speeds. And performance issues had started ever since. How do I fix that? - Quora
Answer (1 of 3): How I fixed it: First open your computer and remove the plug things and clean the port and re-plug the fan (I didn’t removed the whole fan from the circuit, I am talking about the wires. If there is too much dust, then try to remove the fan from the circuit but with the help ...
Reddit
reddit.com › r/buildapc › cpu stock fan fluctuating and constantly changing speeds on new pc
r/buildapc on Reddit: cpu stock fan fluctuating and constantly changing speeds on new PC
December 27, 2019 -
I have the amd stock cooler on my ryzen 5 3600. I can hear a fan running quickly a bit then slowing down for a couple of seconds, its not really that loud but definitely noticeable and a bit annoying. Checked using HWMonitor and the cpu temp (40-50C) + stock cooler speeds are always fluctuating while everything else is more stable. Is this normal? and is there a way to make it more constant? this happens while pc is idle not even while gaming. Also should I download the latest bios for my mobo? (b450 Tomahawk max). Currently using the balanced power plan instead of the ryzen balanced one which did not make a difference
Top answer 1 of 2
3
I've just answered this somewhere else. Try the settings below. 25C/40 60C/50 65C/80 70C/100 What this does is that, at lower temps, the fans will not ramp up as fast or as intensely, and it will only ramp up upon actual use. There's probably also a ramp up and ramp down speed adjustment. Set it to the highest you can find. Should be 0.7s and 1.0s respectively.
2 of 2
2
Yeah, it’s normal for the fan to speed up
Videos
PC top panel's fan's speed is slowing down and speeding up ...
r/pchelp on Reddit: PC Fans Run Inconsistently
05:32
Supermicro fan speed ramps up and down - what's the cause, and ...
16:35
Control Case Fan Speed For Quieter PC - YouTube
How to FIX PC Fan Randomly Speeds Up, Slows Down or ...
Stop Case Fans Ramping Up and Down - PC Building Tips for ...
What is the best way to adjust GPU fan speed on PC
Start with the utility that matches your GPU. Radeon cards are best adjusted through AMD Software: Adrenalin Edition. Intel Arc cards should use Intel Graphics Software. Desktop GeForce cards are usually easiest to manage with MSI Afterburner or ASUS GPU Tweak III when you want a real custom GPU fan curve.
hone.gg
hone.gg › blog home › pc optimization › how to adjust gpu fan speed on pc – fan curve control
How to Adjust GPU Fan Speed on PC – Fan Curve Control - Hone Blog
Can I adjust GPU fan speed on a laptop
Sometimes, but not with the same freedom as a desktop card. Many laptop GPU fan curves are controlled by the manufacturer. MSI specifically notes that custom fan curves are not available for laptop GPUs in Afterburner because the curve is preset in BIOS.
hone.gg
hone.gg › blog home › pc optimization › how to adjust gpu fan speed on pc – fan curve control
How to Adjust GPU Fan Speed on PC – Fan Curve Control - Hone Blog
Is a fan curve better than a fixed fan speed
Yes, for daily use. A fixed fan speed is useful for testing noise tolerance, but a proper fan curve is better because it stays quiet when the GPU is cool and ramps harder only when the card is actually under load.
hone.gg
hone.gg › blog home › pc optimization › how to adjust gpu fan speed on pc – fan curve control
How to Adjust GPU Fan Speed on PC – Fan Curve Control - Hone Blog
Tom's Hardware Forum
forums.tomshardware.com › home › cooling
[SOLVED] - CPU fan is running rather erratically | Tom's Hardware Forum
March 19, 2020 - Are they pwm 4 pin or voltage 3 pin fans 🤔 Some fans do have a minimum speed before they stop btw · Click to expand... 4 pin ... Click to expand... In the bios make sure there all set as pwm if your fans are all pwm mite fix it if that's the issue
PCPartPicker
pcpartpicker.com › forums › topic › 267234-constantly-changing-fan-speed-help
Constantly changing fan speed? Help!!! - PCPartPicker
I think the problem is a combination of the monitoring being extremely sensitive to changes in temps and applying too much or too little voltages / PWM signal to the fan for those moments. Sadly no way to smoothen out or delay fan spin up and down time. This is problematic with CPU's which ...
Box
box.co.uk › blog › case-fan-noise-vibration-fix
Case Fan Noise and Vibration: Causes and Fixes
January 7, 2026 - Dust buildup and poor mounting can make the noise seem worse than it is. Start by cleaning the fan, checking for obstructions, and confirming the correct control mode in the BIOS. If noise persists, the fan may be wearing out.
Hone
hone.gg › blog home › pc optimization › how to adjust gpu fan speed on pc – fan curve control
How to Adjust GPU Fan Speed on PC – Fan Curve Control - Hone Blog
March 25, 2026 - The better answer is GPU fan curve control, which lets you adjust GPU fan speed on PC based on temperature so the card stays calm at light load and ramps with intent when it is actually working.
Reddit
reddit.com › r/buildapc › inconsistent fan speed
r/buildapc on Reddit: Inconsistent fan speed
March 11, 2021 -
So I recently bought some Noctua fans. (1 x 120 mm and 2 x 140 mm) for replacement of the stock front and exhaust fans I had.
They work great when it comes to moving air, and they really are nice and silent. BUT the fan speed seems to be very inconsistent at a higher RPM, I suspect it's my incompetence in setting a proper fan curve for them.
I have an Asus Prime B250M Plus Motherboard which does support PWM, and it is turned on in the BIOS. I firstly tuned all the fans using QFan or whatever it's called in the BIOS, but the fan curves it spitted out were utter garbage. I downloaded AI Suite 3 and tuned them again, which yielded a much better result. I like having the fans spin a little faster when gaming and I often monitor my CPU temps using HWMonitor. So I used the AI suites turbo setting and did some minor adjustments to the CPU Fans (Intel Stock cooler) but whenever in this setting, the Noctuas fluctuate in RPM with about 50 - 70 RPM, which is also noticeable.
Fan curve and fan graph
I know the principles of PWM signals, but I don't think it should be this aggressive?
To my untrained eye, these fan curves look fine, but are they too aggressive here?
H|ard|Forum
hardforum.com › [h]ard|ware › overclocking & cooling
Inconsistent fan speed at idle | [H]ard|Forum
April 13, 2019 - I set the "curve" to be flat vs temp with the fan speed just high enough to do the job. So say 40% @ 20 deg, 40% @ 30 deg, 40% @ 50 deg, 40% @ 70 deg, then let it go on up to 100% at 85 deg.
The Windows Club
thewindowsclub.com › the windows club › general › how to control fan speed on windows computers
How to control Fan Speed on Windows computers
You can either restart your PC ... > Advanced options > UEFI Firmware settings > Click Restart · On the BIOS front page, locate Fan Control Settings ......
Published November 17, 2025
HP Support Community
h30434.www3.hp.com › t5 › Notebook-Software-and-How-To-Questions › Problem-With-Randomly-Fluctuating-Fan-Speed › td-p › 7595310
Problem With Randomly Fluctuating Fan Speed - HP Support Community - 7595310
May 15, 2020 - Perform a hard reset. Performing a hard reset can reset recorded thermal values in memory and enable you to use the computer again, even if only for a short time to access and save any important files before service.
Cybersided
cybersided.com › home › random pc fan revving: what causes it & how to fix it
Random PC Fan Revving: What Causes It & How to Fix It
September 17, 2021 - When you notice increased fan speed, take notice of what programs are running. If an application you’ve installed is loading the CPU excessively, check to see if you have installed add-ons or plugins for that application; sometimes these programs are poorly designed and create unnecessary performance bottlenecks. Disable or uninstall the suspected add-on and see if that fixes the problem.
Tom's Hardware Forum
forums.tomshardware.com › home › components
Fan seems to be inconsistent | Tom's Hardware Forum
September 25, 2013 - Yes an aftermarket fan will make it better.
HP Support Community
h30434.www3.hp.com › t5 › Gaming-Notebooks › Erratic-Fan-Speed › td-p › 8322775
Solved: Erratic Fan Speed - HP Support Community - 8322775
March 19, 2022 - And, also clean the air vents to reduce fan workload. Turn off the computer. Remove any objects near the computer. Use a vacuum to remove the dust from the vents underneath and on the sides of the computer. Turn the computer on, and then place it on a hard, level surface, such as a desk or table. Refer to the article: HP Notebook PCs - Fan is noisy and spins constantly (Windows) By the end of the article you will be able to isolate the issue.
PCMAG
pcmag.com › home › how-to › components
Noisy Computer Fan? Try These 6 Fixes Before Calling Tech Support | PCMag
October 7, 2025 - Noctua makes low-noise adapters that essentially act as a resistor, reducing the voltage sent to the fan and thus reducing its speed. Fan control knobs offer even more fine-grained management. ... Dust is one of those unfortunate inevitabilities when it comes to PCs.
Steam Community
steamcommunity.com › discussions › forum › 1 › 1643170903506592365
Pc fan goes crazy :: Help and Tips
August 13, 2019 - Doesn't matter if it's for high graphics games (That use your GPU more) or games that are more reliant on CPU. Either clean your PC (and maybe replace thermal) or turn off auto CPU fan (In Bios, but i wouldn't recommend that.
Quora
quora.com › Why-is-my-computer-fan-constantly-revving-Even-when-its-not-hot-overheating-and-Im-not-on-my-computer-it-revs-it-does-so-constantly-when-I-am-on-it
Why is my computer fan constantly revving? Even when it's not hot/overheating and I'm not on my computer it revs, it does so constantly when I am on it? - Quora
Answer (1 of 2): Here are some reasons for high speed fans and the cure, in no particular order: You (or the person that set up your computer) may have configured BIOS to run the fan at max speed or set up a “fan curve” that is highly aggressive at cooling your CPU.
CyberPowerPC
support.cyberpowerpc.com › hc › en-us › articles › 39732582286995-How-to-Troubleshoot-and-Resolve-Common-PC-Fan-Issues
How to Troubleshoot and Resolve Common PC Fan Issues – CyberPowerPC Help Center
March 28, 2025 - Navigate to Fan Settings: Locate the fan settings or hardware monitor section in the BIOS. Modify Fan Speed: Adjust the fan curve to lower the RPM (revolutions per minute) of the fans.
Unraid
forums.unraid.net › home › community › motherboards and cpus › [solved] constantly changing fan speeds
[SOLVED] Constantly changing fan speeds - Motherboards and CPUs - Unraid
April 11, 2024 - Tap Add in the top-right corner.
Reddit
reddit.com › r/buildapc › how do you all manage your fan speeds?
r/buildapc on Reddit: How do you all manage your fan speeds?
May 7, 2022 -
Case fans, cpu heat sink fans, radiator fans, etc…
How many fans does your system have and how do you control the speed of them all? I’m looking for ideas…
MakeUseOf
makeuseof.com › home › technology explained › pc fans running at full throttle? 6 fixes
PC Fans Running at Full Throttle? 6 Fixes
May 4, 2024 - Check internal temps, clean vents, check background programs, and fan connections before seeking new fans. Adjust fan curves, install required software for auto control, or replace fans to maintain optimal performance.