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?

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

I built a computer recently and the case fans don’t run a consistent speed. They rev up and then die down and I can’t figure out why.

It’s an ASUS Prime Z790-V motherboard and a Montech Air 903 case.

Any ideas what is going on?

Hello, I hope I'm not doing anything wrong here since I don't use reddit that often.

Issue: The PCs fan randomly increases the speed to 100% out of nowhere in a moment's notice during gaming-related activities. The quality of the game doesn't seem to matter. So far it occurred in:

-Clair Obscur in a dark cave, even in the menu.
-Wuthering Waves, randomly during combat, particularly during Changli's Ultimate
-Abiotic Factor upon entering the snowman room
-Some other games I sadly can't remember

I wanna clarify, this is a RECENT issue. The PC is prebuilt and about 5-6 years old by now and didn't have any problems up until about 2-3 weeks ago where the first instance happened in Abiotic Factor. Seemingly at random, the fan's speeds go from 1300RPM to 4000+RPM for 2-3 seconds, before dropping down to 1300RPM. This occurs during very specific triggers and although the interval seems to happen at random, it's certainly happens during trackable moments.

The PC is currently freshly dusted, the average temperature lingers between 77-84° C during gaming on High to Epic settings and all fans run smoothly and without any issues outside of those random moments. 99% of the time it's the GPU fan exclusively, sometimes it's "louder" and I presume it's the case fans too, but I couldn't identify that yet as it happens very rarily.

I'm running Win11, 32GB RAM, Intel I9-11900F, an Nvidia Geforce RTX 3070TI, on an Z590 Plus and all drivers are updated.

If anyone could help me fix this, I'd be seriously grateful! I have no clue what's causing this.

Hey guys, I built my PC last November and it's ran well since then but within the past few days I've noticed something that I think is a bit odd.

I bought The Witcher 3 to play when my friends aren't on or when I just want to play a good single player game. While playing, I noticed that my PC fans were speeding up and slowing down what I considered to be pretty randomly. I figured it was since I had a lot of the graphics turned up pretty high so I turned some of them down but the fans still seemed to be fluctuating in rpm's. I then noticed they were doing similar fluctuations while I was playing CS:GO, where I have all but one or two settings turned down as low as possible.

I have an NZXT kraken AIO so I checked the connections plugging in the pump to make sure they weren't loose or anything. I guess that really only leaves my GPU fans and case fans but I'm not sure what I need to do next if there is anything wrong in the first place.

My build is as follows:

Case: NZT S340 elite

CPU: Ryzen 5 1600

GPU: Asus Dual Series 1070

CPU Cooler: NZXT Kraken X62

Case Fans: stock NZXT for exhaust and stock kraken fans for intake

Edit: I usually play with headphones on so this may have started earlier but when i was playing The Witcher using my speakers is when I first noticed the fans doing this. I also had my headphones off when I was playing CS:GO and noticed it.