mechati

OK, so got question regarding that statement about rpm's:
what is more important:
1- cfm (somehow related to rpm)
2- static pressure?

if i take 20mm thick and 38mm fan both running at 1400rpm - which one is going to be more silent?

Dennisjr13

The 20mm thick fan will almost always be louder than a 38mm fan when both are pushing the same amount of air. Most choose to go with the thicker fans if they have the space for this very reason.

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mechati

Another question - is there a difference if I mount the fan horizontally or vertically? Any impact on bearing, loudness, period of working properly, etc. I haven't seen any precautions from manufacturers side that the fan one or another should be mounted only for example vertically. If there is any info about that - I would be grateful for link or any other directions.

Spotswood

Mounting sleeve bearing fans in a non-vertical orientation will usually result in more noise and reduced lifetime.

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Rich
Custom Wooden Case Builder

Mr.FraG

Noctua, but are little expensive -.-

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okorn

Noctua.

Avoid SilentX, they brek too soon!

JSB

My two favorites 120mm fans are these

Noiseblocker MF12-S2


Nexus Real Silent

OC'ing Noob

Out of your choices only the Scythe S-Flex can be considered silent...

Only S-Flex and Noctua are known in that list as having high quality silent fans.

Really silent yate loons don't really have much airflow to it. That's why they are only usually good for htpc's or get quiet a few of them.

Noctuas are great if you can spare an arm or leg.

noiseblockers i heard good things about but havent had time to mess with one. nexus is an undervolted YL.

SilenX simply blows. $20 bucks for quality inferior to yate loons.

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FS: Lots of stuff!

Green Mother Worklog

Proud member of the Stinger Slinger club, HWLabs Black Ice GTX 480 club, and Intel Core 2 Quad Q9450 club!

FAQ: Is Liquid Cooling for Me? and FAQ: Planing and Installing Your Liquid Cooling System
Water Cooling Configuration Guide and Hall of Blocks: CPU

OC'ing Noob

CFM is how much cubic feet per minute. It basically means how many cubic feet of air can the fan move per minute. The usual correlation between rpm and cfm is a proportional relationship; higher rpm leads to higher cfm.

Static pressure is how much pressure the fan generates when it blows out the air or sucks the air in. In computer terms it means how hard a fan chokes when sucking air through anything besides open air aka radiator or heatsink. Fans like Panaflo, Noctua, YL, Scythe, and especially Papst and Sans Ace have very good amounts of static pressure. An easy way of measuring static pressure would be to hold increasing amounts of sheets of paper behind a fan and see how many sheets it can still blow up.

__________________
FS: Lots of stuff!

Green Mother Worklog

Proud member of the Stinger Slinger club, HWLabs Black Ice GTX 480 club, and Intel Core 2 Quad Q9450 club!

FAQ: Is Liquid Cooling for Me? and FAQ: Planing and Installing Your Liquid Cooling System
Water Cooling Configuration Guide and Hall of Blocks: CPU

Genzel

I dont notice the S-flexs. The case(MozartTX) I got came with a bunch of cheap Thermaltake 120's. Left some of them in because they were free and I went overkill on the psu. The higher rpm S-flex 120s arent noticable at 100%. The thermaltakes and stock gpu fan are the only things that are really audible in my case .