It is currently Tue Oct 23, 2018 12:10 pm

All times are UTC - 8 hours




Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: The marketing of quiet case fans is somewhat deceptive.
PostPosted: Sun Oct 07, 2018 4:31 pm 
Offline

Joined: Sat Sep 23, 2017 6:49 am
Posts: 119
There is a tradeoff between higher fan speed (for more airflow) and lower fan speed (for silence). A manufacturer can take two nearly identical fans made up of the same parts, have one run at 2000 RPM and the other run at 1000 RPM. The former can be marketed as a performance fan while the latter is marketed as a silent fan even though one is not inherently louder than the other.

If a fan (marketed for silent PC's) is mainly quiet because its locked down to running at a low RPM, then it's not really any quieter than taking a generic fan and lowering the RPM setting. Measuring decibels alone does not provide proper context. A performance to noise ratio is a more accurate metric. A 22 db fan might rank as quieter than a 24 db fan, but what if the 24 db fan has significantly better airflow? If an efficiently designed "quiet" fan at 60% load offers X airflow at Y decibels, and a "performance" fan at 40% load offers X airflow at Y decibels, the marketing doesn't matter because they both do the exact same job.

Low RPM fans can be better in some instances. For 3-pin fans, voltage control is less precise so it may be hard to voltage control a high RPM to a quiet level. For 4-pin fans, some motherboards require a 50-60% minimum fan speed in their BIOS settings options, and half of 1000 RPM is quieter than half of 2000 RPM. Some people don't want to be bothered with SpeedFan, installing a fan controller and some people don't even want to be bothered with PWM in general. Otherwise, there's not really any need to limit the machine's potential performance, since it's possible to make a high RPM fan spin slower but not to make a low RPM fan spin faster.


Top
 Profile  
 
 Post subject: Re: The marketing of quiet case fans is somewhat deceptive.
PostPosted: Tue Oct 09, 2018 3:56 am 
Offline

Joined: Tue Nov 04, 2008 6:03 am
Posts: 595
Location: Sweden
It's also important to notice that "quiet" fans typically also lack in ability to build pressure.
If your fans are to pull air through a dust filter you need stronger fans to generate a suitable air flow.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 8 hours


Who is online

Users browsing this forum: No registered users and 6 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group