does anyone have any experience with these? i've looked at the ones from noiseblocker, silenx, evercool, and cooler master, but there are mixed reviews about the noise from each of these fans
i know noctua is making a slim version of nf-a8, but it seems it'll be quite some time before it becomes available for purchase
quietest 80x15mm fan
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NeilBlanchard
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Re: quietest 80x15mm fan
Greetings and welcome to SPCR,
It has been a while since most of us have even dealt with a 25mm thick 80mm fan, but the same principles apply. The bearings and motor, and the frame material and geometry, and blade shape and RPM range - are the main factors.
For example, this fan has ball bearings and opaque plastic (both good things), but it has 2500RPM and the trailing edges of the fan blades are nearly parallel with the support struts (which creates noise):
https://www.directron.com/ec8015m12ca.html
It also has just 5 blades, which means it is designed to work at higher RPM's - fewer blades for higher RPM.
This fan has many more blades:
https://www.quietpc.com/zm-op1
... but they are relatively straight (and are not swept much) and they are steep angle of attack, so they will move more air at a given RPM, but probably be louder than if the blades are swept a lot and had a less aggressive angle of attack.
This fan is likely quieter, though it has a sleeve bearing, and may not last as long:
https://www.newegg.com/Product/Product. ... 6835103081
The blades are swept forward, with a lower angle of attack, and they are nearly perpendicular to the struts.
It has been a while since most of us have even dealt with a 25mm thick 80mm fan, but the same principles apply. The bearings and motor, and the frame material and geometry, and blade shape and RPM range - are the main factors.
For example, this fan has ball bearings and opaque plastic (both good things), but it has 2500RPM and the trailing edges of the fan blades are nearly parallel with the support struts (which creates noise):
https://www.directron.com/ec8015m12ca.html
It also has just 5 blades, which means it is designed to work at higher RPM's - fewer blades for higher RPM.
This fan has many more blades:
https://www.quietpc.com/zm-op1
... but they are relatively straight (and are not swept much) and they are steep angle of attack, so they will move more air at a given RPM, but probably be louder than if the blades are swept a lot and had a less aggressive angle of attack.
This fan is likely quieter, though it has a sleeve bearing, and may not last as long:
https://www.newegg.com/Product/Product. ... 6835103081
The blades are swept forward, with a lower angle of attack, and they are nearly perpendicular to the struts.