Theres lots of PC info on the best "silent" components for a PC, many of
which are shared by Macs. I won't post PC info to the list but if you mail
me I'll send you some links. In the 9500 I have it has a 80mm fan and the
9600 had a 120mm fan. You can buy silent 80mm fans pretty easily, look for
ones that have a rated DB of below 20db. For example Papst make a number of
80mm silent fans below 20db. Quiet 120mm fans are harder to source. Many
wire them to run at 7v/5v to bring down the speed and thus the noise. You
can also by fan adapters, the Zalman fanmate is one, that allow you to
reduce the speed via control knob.

However be changing the fan in you PSU or computer you also have to be aware
of the cfm (the amount of air it pushes) that the fans produce. If you lower
the cfm that the unit was orginally specified you run the risk of components
overheating, failing or even a fire risk. In many cases the original fan has
become noisy over time and a new unit will improve noise levels
considerably. Also the original fan may have been over specified you may be
able to get away with using a fan with a lower cfm, espeically if the
computer location ambient temp is pretty low anyway.

As with all things electrical, especially PSU's they carry a large voltage
that could possible kill you. So don't muck about with them unless you know
what you are doing. Bring them to a local repair man/tech for modification
to be on the safe side.

>From experience, its rarely one component that cause noise in a computer.
Its usually the sum of a number of parts, HD's optical drives, fans on GFX
cards etc. Normally once you fix one you notice the noise of something else.
Though I'll agree that older fans and SCSI drives are the worst culprits.


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