which fan is the noisiest of the Computer?

[Srek]

From my experience any fan is a likely candidate. I usualy test this by simply stopping one fan after the other to determine which produces the most noise. Make sure to use something not to hard to stop the fan so you don't damage it, i recommend to NOT use your fingers ;)
Cheers
Björn

[minkey]

well there are allot of factore when it comes to computer fans.
Main things you want to look at are as follows:

A.) light = noise. (unless you are willing to buy a 48 dollar fan )
B.) There are different ways the fan sits on the router, there are the ones that use magnets, the ones that use borebring (spelling?), the ones that use balls.
C.) the amount you wanne pay on a fan will determin the noise level of the fan in allot of cases (NOT always)
D.) It's never just the fan that makes the noise its usually the case that helps in the about of DB produced by the fans. (fancey cases with a big side opening and not sealed so well tend to be usually much louder)
E.) Number of fans in the system. Something people usually dont realise is that in some cases *not all* you may get a much quieter sound coming form the fans and the case by simply having more than 2 fans in the system creating a higher air circulations..... hence keeping the system cooler and causing the fans to run at a much lower RPM.
F.) Fan direction is another thing that causes allot of sound. make sure the fans are open and not covered by anything such as wires, dust...etc. Another thing is think how the air is suppose to flow in there and where you want the cool air to be sucked in and where you want the hot air to exit. for example if you have you're intake set right below your PS fan then you are intaking hot air and causing the interior temp to raise and the RPM to rise hence more noise.
G.) CPU fan and ceperate intake. This one allone will in allot of cases cause the temp to go down by allot and the noies reduction and also lower RPM.

I know that these are a very brode outline but the simple things are what cause the higher DB. If you're just looking for a certin brands or such I can make you a list with what brand produces what level of DB.

Cheers.

[Srek]

Let me add
H.) Size. If you have the choice between two fans with the same bearing choose the largest one fitting. You can use it with less rpms while having the same amount of air moved.

[salmonmoose]

For my personal machines, I use tip driven fans, unlike conventional fans that have a central motor and an axle tip driven fans have magnets on the blades of the fans and coils surrounding the intake.

This means they are free spinning, and deathly quiet, and will quite happily spin for a while after they're turned off. Due to the nature of their design their blades are quite heavy, and you will cause yourself damage if you put your fingers in their way.

The ones I use for heat-sinks also have bi-metal heat sinks, a central core made of copper rests on the chip, and helps make the rest of the alumninium heatsink work more efficiently.

Overall I've had the most trouble with older GPU heatsinks, and also Chipset fans. They tend to only need to be small and as such don't generate good gyroscopic action which helps deaden noise.

That said, I've possibly invested more in the air-flow for my system than some people spend on entire comptuers :) the bane of my system is the racket that comes out of the DVD-R :)

[salmonmoose]

Here's a bit of a work-over of the technology:

http://www.dansdata.com/tmdfan.htm

[Giap]

Thank you all and I'm sorry for replying you guys late.

I tried using a small soft pole to stop and the fans like Srek has mentioned and I found out that the processor fan is noisiest. The dust sticks a lot on the fan, that's why it made so much noise. I cleaned it but the noise is still the same. I think dust got stuck inside the fan so I may change to another fan with less noise.

Anyway, thank you guys again.

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