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- CPU fan problems
- At my comp
September 25, 2005, 1:19 am
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My PC has been pretty quiet and cool since I got it about four months
ago, but now my AMD CPU fan is loud around twenty minutes after I boot
the machine and my case is much warmer! By now, the fan's blades are
coated with a very thin layer of dust.
-Is it possible that it's just poorly made and failing early, or is it
unusually sensitive to dust and need compressed air?
-If a new fan is required, what is the cheapest replacement fan (for
Socket 939 AMD64 3000+) that is as quiet or a little better than the
CPUís stock fan? I would like recommendations based on products/prices
from a reputable store like newegg or mwave.
Re: CPU fan problems
On Sat, 24 Sep 2005 21:19:07 -0700, At my comp
Have the ambient room temps remained constant all the while?
what about average system load or component changes (as it
pertains to heat generation)?
The stock, retail packaged AMD fan or an aftermarket fan or
Well if the case is warmer, of course the fan should be
noisier as it has to spin faster to keep CPU as cool.
Determine why the case is warmer and ignore the CPU fan for
the time being unless it sounds more like the bearing if
failing rather than merely an increase in RPM.
No they aren't generally sensitive to a thin layer of dust
on the blades.
AMD retail fan should not fail this soon. Aftermarket fans
depend entirely on the quality of the specific model and
specimen of fan. "Usually" even a cheap junk generic fan
will run for several months, but if that's an appropriate
classification of your fan then put a drop of oil in the
bearing and begin searching for a suitable replacement fan.
This is of course presuming you have checked things like the
air intake passages into and out of the case to ensure they
aren't partially clogged with dust or other debris (often I
get systems that are clogged with cat hair- the long hair
strands will effective bridge small case vent holes and more
rapidly cause other dust/hair/etc accumulation. Each system
and environment varies- consider yours.
I suggest you not get the cheapest, as that is one of the
more likely ways to end up with a short-lived and noisey
fan. Chose a name brand, (as-in, a major fan manufacturer's
brand, not a PC parts relabeler product) thickest possible
and lowest RPM tolerable fan. On a CPU, generally that
would be a dual ball-bearing fan. Case intake or exhaust
can be less critical of bearing type as the heat density is
lower, a good quality sleeve bearing fan (like panaflo)
I suggest any of the popular online vendors, search for
their fan product pages and compare fans with same
dimensions as yours.
Re: CPU fan problems
Thanks. I discovered why the CPU fan was so loud. Yesterday, I
discovered that the CPU fan was reported as the only fan runningóat
6000RPM! Usually, my PC is so quiet that I can hardly tell that itís on.
I opened the case (while the system was running) and tapped the exhaust
fan gently, and it immediately activated. The CPU fan slowed to normal
speed seconds later, and the whole system has been cool and quiet again
I will definitely spray some air to try to clean any invisible layers of
dust. I have an Antec Sonata, which has been the best case Iíve owned,
but the huge exhaust fan grill and Antec logos (bulleted holes) on both
sides are probably to blame for most of the dust. I just remembered that
this model has its own washable filter that should be washed monthly, so
that will probably look like a linty dryer filter by now :) Someone told
me that thin nylons can filter dust from coming into the system, so I
will seal the grills after everything is clean.
I would like to lubricate my fans even if they're ok. What oil is
appropriate for them?
Re: CPU fan problems
On Sun, 25 Sep 2005 17:05:14 -0700, At my comp
A fine layer of dust is a rather minor problem if/when the
system has sufficient cooling. Your exhaust fan is a more
significant issue by far. Filters are a nice concept and
can be implemeted well, BUT they also significantly reduce
airflow, sometimes by over 50% (particularly if the filter
is only covering the same area that was formerly the passive
or active (fanned) intake. When I implement filters I cut
out larger areas of the case, and put a perimeter of
weatherstripping foam inside the filter-case mating surface
so the filter stands away from the case wall by a little
over 1 cm.
This allows a substantially larger filter surface area to
decrease filter impedance (and/or lengthen service
intervals, whichever applies per system/implementation).
You may also need to set the airflow up for positive
pressurization in order to keep the most dust out. It can
be difficult to do these things, quietly, on many cases.
Thick 120mm x 38mm fans help a lot.
Very thick oil, bordering on very light grease. I use a mix
of synthetic Mobil-1 oil and grease till the drop-point is
just above room temp. Works well, fans that have seized run
for several times as long after being relubed, as they did
from being new until seized the first time... and this only
considers lubing them once, not relubing later.
However, these things are best done to rare/proprietary
fans. If given the option it's better to replace poor fans
with good quality, name-brand dual ball bearing fans. Papst
or Panaflo are the only two (commonly available) makes I"d
consider in sleeve-bearing versions for any mid-to-high end
system... or any system you need to be as reliable as
possible for that matter.
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