Reduce fan speed


G

Gary

sounds like my pc is ready for take off.... The fan gives 3 sounds: Loud,
louder, loudest and alternate on their own. Is there any way to reduce the
fan speed or is there some program that is constantly running?
 
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S

SC Tom

Gary said:
sounds like my pc is ready for take off.... The fan gives 3 sounds: Loud,
louder, loudest and alternate on their own. Is there any way to reduce the
fan speed or is there some program that is constantly running?

It may be running so hard because the PC is overheating. Has it always been
this loud, or is a fairly recent development? How old is the system? Have
you ever cleaned out the interior, heatsinks, and intakes? Try a program
such as HWMonitor http://www.cpuid.com/hwmonitor.php to check your temps.
If the system is pretty clean, then it may be something running hard in the
background. Use Task Manager to see if that's the problem.
 
J

Jose

sounds like my pc is ready for take off.... The fan gives 3 sounds: Loud,
louder, loudest and alternate on their own. Is there any way to reduce the
fan speed or is there some program that is constantly running?

You probably don't want to reduce the fan speed - you want to know why
it is changing, if it is normal and if it is not normal, fix it.

We don't know anything about your computer, so do this and we will:

Please provide additional information about your system:

Click Start, Run and in the box enter:

msinfo32

Click OK, and when the System Summary info appears, click Edit, Select
All, Copy and then paste the information back here.

There will be some personal information (like System Name and User
Name), and whatever appears to be private information to you, just
delete it from the pasted information.

This will minimize back and forth Q&A and eliminate guesswork.

If you have a desktop, here are some general cleaning instructions:

http://www.bleepingcomputer.com/tutorials/tutorial118.html

You do not want the inside to look like these pictures:

http://www.theregister.co.uk/2009/11/13/ventblockers/print.html

You need to open the case and determine if the fan is in the power
supply, CPU or video card fan (if so equipped) and then you can decide
what to do. Which is the noisy fan? Without that information, you
will be guessing. Fan bearings are sealed and to not require
lubrication - if the fan is defective, you need to replace it - not
lubricate it. Fans can wear out. If it is dirty, you need to clean
it.

It is interesting to know the temps, but when you see the temp, will
you know if the temp is too high for your configuration or is it
within an optimum range? What will you do when you know the temps?
What is too hot for you? My desktop CPU temperature is 31C. My
laptop is 34C. How do I know if that is too hot and what do I do
about it?

Fan speeds can sometimes change when they need to and this can be
annoying when they do their job so you can adjust them to always run
at some maximum speed so the speed never changes. It could be
changing because it is supposed to change based on what your system is
doing at the time.

Are you playing games? Games are sometimes CPU and video intensive
and can cause temps to go up a lot. Do you have the issue when you
are not playing games? If you are a gamer, your system may not be
designed for the intensity and you may need to make some adjustments.

If you have a laptop, the cleaning instructions are available, but
depend on your make and model (which we'll know when you do the first
part).
 
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P

Paul

Gary said:
sounds like my pc is ready for take off.... The fan gives 3 sounds: Loud,
louder, loudest and alternate on their own. Is there any way to reduce the
fan speed or is there some program that is constantly running?

Run a copy of Speedfan. Don't adjust anything. Just read out the
temperatures inside the computer. They will give you some idea
why the computer fan is running so aggressively.

http://www.almico.com/sfdownload.php

http://www.almico.com/speedfan440.exe

The program, when it is running, looks like this.
Using the main "readings" windows is good enough. Note
that the labels used ("CPU", "System", "HDD") may not be
correct. It may say "Temp 1", "Temp 2", "Temp 3". You can
post whatever temperatures it shows, and get some feedback.

http://www.almico.com/images/mainwindow.gif

In that example, a CPU temperature of 49C might be fine,
if the CPU was flat out. Generally, you want to stay below
65C, so that you get the full performance from your computer.
It may slow itself down otherwise. (Some CPUs in the
Intel Prescott Pentium 4 generation, may be difficult to
cool well. There is no reason to panic if you note a relatively
high temperature. If the CPU type is one of the lower power
variety, then you'd be more curious if it was running 65C.)

The hard drive temperature is measured by a thermistor inside
the drive. Newer drives are probably equipped with a real readout.
There are cases of hard drives, which report a temperature, but it
never changes. In that Speedfan example screenshot, a temperature
of 30C is pretty good for the hard drive. If it was hitting 50C,
you might be concerned. Fresh intake air on my computer blows right
over the drives. My computer is reporting right now, that both my
hard drives are at 26C.

Another program that can report hard drive temperature, is HDTune.
Version 255 is the free version, suitable for quick checks. The
drive temperature is shown on the screen when the program is running.
(This works as long as the path to the hard drive, supports
SMART diagnostics. Some RAID controllers prevent that kind of access.)

http://www.hdtune.com/files/hdtune_255.exe

The purpose of doing this kind of checking, is to get some
idea how dirty the inside of the computer might be getting.

In some cases, when tiny fans are used on things like video cards,
the lubrication on the fan may evaporate, and the fan can stall.
The GPU may get so hot, as to melt some of the plastic in the area.
To check the video card GPU temperature, if Speedfan can't see it,
you can use GPUZ.

http://www.techpowerup.com/gpuz/

The hottest report I've seen so far for the GPU on a video card,
is 200C, and somehow the card survived. My current video card
runs the fan at low speed and reports 48C or so.

By taking note of the room temperature, and internal component
temperatures inside the computer case, when the computer is
clean and new, you have a "baseline" for comparison. If you
check later and find elevated temperatures, open up the case
and find out why. It could be dust and dirt plugging a filter.
Or, like in the video card case, the fan may have melted and
there might not be any cooling at all.

Some Dell/HP computers may use a large central fan, to move
cooling air through the box, as well as cool the CPU. The fans
may have quite large CFM ratings, like 130CFM. If the computer
ever turns up that fan, you'll know about it right away :)
It could be your CPU is overheating, or the air inside the
computer case is a lot hotter than normal. I expect the reason
they use fans like that, is to scare the hell out of you when
the computer is getting a bit warm :) It makes it easier
to convince people to maintain their computer, if it makes
scary noises :)

You have to be a little careful when cleaning the computer.
I managed to damage a fan the other day, while wiping dust off
the fan blades. You can damage the bearings on a cheap fan,
with only a little bit of mechanical force. The result may be
excessive vibration, the next time you use the computer. I had
to buy a 120mm replacement, to eliminate the noise. Fans come
in about four capacity ranges (low, medium, high, ultra), so
if you ever need to replace a fan, you need to match the type
to get the same performance. It isn't as simple a matter
of just buying something with the same mechanical dimensions
(like 120mm x 120mm x 25mm). In the case of the "hoover" style
fans used on things like the BTX form factor computers, you
can find more or less exact replacements listed on the web for
them. You wouldn't expect to find the right fan at Radio
Shack in that case.

Good luck,
Paul
 

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