Question rear case fan random spikes

[Monko87]

hi, I noticed that the fan has random peaks (sometimes 2 in 20 seconds, sometimes not even one in more than 1 hour) and I would like to understand if it is caused by something in particular. Normally it runs at 900rpm but the peaks take it to 10000rpm for just a second, so theoretically that value isn't even real in such a short time.
the fan is connected to the motherboard via a 3-pin cable and is set to auto dc by the bios, I tried both changing the port where it is connected and setting it manually and the situation does not change or even gets worse, the number of peaks increases.
motherboard: msi mpg z590 gaming plus
fan: DeepCool 140mm already present in the case.
Ps. tested withArgus monitor and HWinfo too and get the same results.

https://imgur.com/a/Dfsi7Pl

View: https://imgur.com/a/Dfsi7Pl

 

[Colif]

There is a bad connection somewhere causing spikes in the speed signal reaching the mobo header. This could be an internal issue in the fan, and there's no way to fix that other than replacement of the fan. But you CAN try this just in case the problem is only a dirty contact where the fan plugs into the mobo header. Locate the cable and header for that fan. Carefully unplug the fan, then plug it back in again. Do this several times. Inspect around to ensure you have NOT dislodged some other item while working. Close up and turn on your system, and look at what the fan speed readings are now. You may have to run a while since this is a sporadic thing.

later in same thread

Now I think it the fan speed spikes were/are caused by blips in Argus monitor because, after I replace one of the fans, the spiking continued. I believe the spike occur when I make a change to the Argus parameters like minimum fan speed.

So, in summary, it really doesn't matter. The fans aren't really spiking. The fans and connections are working properly.

[SOLVED] - Fan monitor says fan spikes to 13,000 RPMS!

According to Argus Monitor, one of my chassis fans occasionally spikes to over 13,000 rpms!?!? It is only momentary but it happens several times per day. Is this a sign that the fan is begining to fail in some way or getting stuck? It is a 4" Corsair DC fan that is about 5 years old. I think...

forums.tomshardware.com

not sure the 2nd part applies to you if it shows on 2 monitoring software results.

 

[Monko87]

later in same thread

[SOLVED] - Fan monitor says fan spikes to 13,000 RPMS!

According to Argus Monitor, one of my chassis fans occasionally spikes to over 13,000 rpms!?!? It is only momentary but it happens several times per day. Is this a sign that the fan is begining to fail in some way or getting stuck? It is a 4" Corsair DC fan that is about 5 years old. I think...

forums.tomshardware.com

not sure the 2nd part applies to you if it shows on 2 monitoring software results.

so there is no way to understand if the problem is with the fan or the motherboard? Should I just try buying a new fan and see how it goes? If so, can you recommend some good fans for the rear side of the case?

 

[lojikal]

so there is no way to understand if the problem is with the fan or the motherboard? Should I just try buying a new fan and see how it goes? If so, can you recommend some good fans for the rear side of the case?

Get a Noctua 140mm Premium Quiet Quality Fan with AAO Frame Technology (NF-A14 PWM).

 

[Colif]

Get a Noctua 140mm Premium Quiet Quality Fan with AAO Frame Technology (NF-A14 PWM).

No need to get one that doesn't at least try to match color scheme - https://noctua.at/en/nf-a14-pwm-chromax-black-swap

I have 3 of those as exhausts.

 

[Monko87]

fixed buying an ARCTIC P14 PWM PST A-RGB it's not the noctua but for what it's needed it performs well, silent and colourful 😀 ty for the info!