Cpu cooler fan 100% RPM problem

[HypedKid]

So, I got new cpu cooler(be quiet pure rock slim) and I was setting fan speed in bios and noticed that at 100% rpm it gives 2200 rpm ,but sticker on fan says 2000 rpm at 100%

[thisforumsucksassdeletemya]

What do you mean "on cooler"?

[HypedKid]

3 minutes ago, violentnumeric said:

What do you mean "on cooler"?

Oops, I mean small sticker on fan 

[thisforumsucksassdeletemya]

The RPM rating of the fan isn't always exact. They have a different testing environment. They may have had denser air, or a cooler room which would make whatever lubricant the fan uses run slower in their testing. There's nothing wrong with it running a bit higher or lower than what they claim. Also keep in mind the readings aren't necessarily exactly correct.

 

My CPU cooler fan is a Corsair ML120, supposedly runs 400-2400RPM. The slowest it'll go for me is 1000RPM and the fastest is just over 1800RPM.

[HypedKid]

9 minutes ago, violentnumeric said:

The RPM rating of the fan isn't always exact. They have a different testing environment. They may have had denser air, or a cooler room which would make whatever lubricant the fan uses run slower in their testing. There's nothing wrong with it running a bit higher or lower than what they claim. Also keep in mind the readings aren't necessarily exactly correct.

 

My CPU cooler fan is a Corsair ML120, supposedly runs 400-2400RPM. The slowest it'll go for me is 1000RPM and the fastest is just over 1800RPM.

Ooo, thanks!

[_Hustler_One_]

In most of fans there's almost always a +/- 10% rating for their max speed, that means it can be 10% less or more than the rated max speed just like this,

 

 

In other case it can be more than +/- 10%, it's between 10-20%. For example of this case is my own NF-A14 3000 RPM, on its official spec it's stated as +/- 10%, which is it can be 300 less or more so it should be 3300/2700 RPM based on the spec, but in reality I found that its max speed is 2500RPM which is 17% less than its official rated max speed.

 

 

If you ask, why I use this 3000 rpm fans because it will be noisy af., I need static pressure as much as possible to cover what people and reviews says about my PC case which has bad front intake airflow, but I ended up found it's underrated, and the noise of the Noctua iPPC fans is overrated. So all my PC components got a breeze inside the PC case. 

[HypedKid]

13 hours ago, _Hustler_One_ said:

In most of fans there's almost always a +/- 10% rating for their max speed, that means it can be 10% less or more than the rated max speed just like this,

 

 

In other case it can be more than +/- 10%, it's between 10-20%. For example of this case is my own NF-A14 3000 RPM, on its official spec it's stated as +/- 10%, which is it can be 300 less or more so it should be 3300/2700 RPM based on the spec, but in reality I found that its max speed is 2500RPM which is 17% less than its official rated max speed.

 

 

If you ask, why I use this 3000 rpm fans because it will be noisy af., I need static pressure as much as possible to cover what people and reviews says about my PC case which has bad front intake airflow, but I ended up found it's underrated, and the noise of the Noctua iPPC fans is overrated. So all my PC components got a breeze inside the PC case. 

Oo, so even expensive fans don't have stable RPM.

[LogicalDrm]

On 2/9/2019 at 9:20 AM, HypedKid said:

Oo, so even expensive fans don't have stable RPM.

Price of the fan is irrelevant for rpms. There are so many factors, like power delivery from motherboard, and control pulses/scheme from motherboard than can affect it. So don't blame on fans manufacturer for every issue you may encounter.