case fan

[cupcake]

new computer arrived on wkend. seems like the case fan is a bit noisy.

i read from somewhere, i can reduce noise by installing another case fan and
making them both run at half speed..
is that right?

do i just connect them up in series??

thanks in advance...

 

[Chris Stolworthy]

new computer arrived on wkend. seems like the case fan is a bit noisy.

i read from somewhere, i can reduce noise by installing another case fan and
making them both run at half speed..
is that right?

do i just connect them up in series??

thanks in advan

You don't even need to necessarily add another fan...that is if running your
fan at half speed doesn't seriously affect your system...I am going to
assume you are using an 80mm fan. You may also consider punching a hole big
enough for a 120mm fan then getting a silenx fan. I have been extremely
please with mine.

 

[kony]

new computer arrived on wkend. seems like the case fan is a bit noisy.

i read from somewhere, i can reduce noise by installing another case fan and
making them both run at half speed..
is that right?

do i just connect them up in series??

thanks in advance...

The general concept is correct, that if you increase number of
fans you can proportionally decrease flow from each fan (by
reducing RPM), provided they are stategically located and work in
tandem to move air in similar direction, complementing rather
than fighting against each other.

By "series" I assume you mean putting them back to back? That
usually isn't beneficial except in rare situations where there is
excessive pressure needed... in other words it wouldn't be as
beneficial as resolving the impedance to flow elsewhere, and then
if more flow rate or noise reduction is needed, put them in
parallel instead. If by "series" you instead meant one blowing
into the case at the front and another blowing out at the rear,
that can help, but may not be necessary.

The real answer is that your question is too vague for us to
give a useful reply, without specifics of the case, proposed
mounting locations, system temp, particular fans, etc.

 

[cupcake]

my wrong.. by series i meant circuit wise...
12v power hooking 2 fan in series so each get 6v so they go half speed??
not very good with electronic. sorry...

 

[Apollo]

my wrong.. by series i meant circuit wise...
12v power hooking 2 fan in series so each get 6v so they go half
speed?? not very good with electronic. sorry...

I don't think this will work, what you're after is the 7 volt trick, google
for it, by swapping two leads around in a molex plug you can get 7 volts,
almost all fans are quiet at this voltage. Or you could buy an adapter to
do this if you don't feel confident doing the mod.

 

[kony]

my wrong.. by series i meant circuit wise...
12v power hooking 2 fan in series so each get 6v so they go half speed??
not very good with electronic. sorry...

Due to the type of motor used, "almost" none of them can be wired
in series.

You could put a resistor(s) in series with the lead (value varies
per fan but 68 Ohm is a good starting point) or a series of
diodes (about 10), in series, or a fancy fan controller, a
rheostat, or the infamous 7V mod, which usually is achieved by
using a power supply plug adapter with it's 5V and a ground wire
swapped such that fan gets 5V on ground lead, for 7V difference.

Keep in mind that some fans don't spin consistently at 5-6V, must
be nearer 7V to keep RPM high enough to prevent causing a
pulsing sound, which could actually make fan louder than if it's
RPM were slightly higher. Some fans don't exhibit this at all
though.