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Loud CPU Fan

  • CPUs
  • Hewlett Packard
Last response: in CPUs
June 18, 2011 3:04:13 PM

Hello All
Just had a new motherboard installed a Biostar N68S+ In my HP computer that my factory MB went
bad A discussion I had under harddrives so not to repeat that again. Long story short this thing is
Very loud and runs all the time My old one would powder down went it went to sleep . and not
real loud when active. Question Is there different fans which may not be so loud are I can set
to powder down when It goes to sleep . I Have a AMD CPU Can give more detials if needed
this is just a general question at this point . Not a high end machine just out of a box store.
Here is a link to my MB
Thanks in advance for any help

More about : loud cpu fan

a c 120 à CPUs
June 18, 2011 3:50:13 PM

An aftermarket cooler with a bigger fan will be quieter, we need to know how big your case is to suggest a suitable model though, as clearance from the cpu to the sidepanel varies
measure from the top of your old heatsink to the side panel then add the thickness of the heatsink and thats the number we work with for your replacement unit
June 18, 2011 6:14:49 PM

Ok, you old mother board controled the cooler fan in response to temperature.
Are you using a new cooler or the same one?
Did you clean CPU and cooler and use fresh thermal paste for install.

If yes to above go into bios and enable CPU fan control if possible.
I do not know the default settings or what control is allowed.
Obviously your old board controled the cooler fan.
The motherboard sensor could be "reading" hot, a Bios setting needed, the fan now defective, or the too much paste.
I vote Bios setting or motherboard problem.

Remove the side cover, point a house fan at the innards and see if this effects temperature. This test will"prove" or "eliminate" case cooling as a problem. I suppose a case fan could be iunplugged.
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June 18, 2011 9:12:30 PM

Thanks for replys
As for as which fan the old or new I am Not sure as I had it installed by local shop I Posted that problem under the hard dirve section of this forum date
6-7-11 called ( Comuter does not recoginze Seagate hard drive ) Which tells the long story of what happen after posting my problem at that time 1St thinking it was hard drive turned out may be motherboard. rather than buying parts and not being real sure of whick problem I may have took it to a local shop . and had them check to make sure which part was bad. turned out to be Motherboard not hard drive as 1st though. will have to check with them monday to see which fan they used. ect. I will look in bios for setting thats a good ideal . In
doing some homework of my own read the this board may not support a veriable speed fan. still checking it out. this is the spec. of my computer before Mother board was changed out. It is a Mid sized case per HP Web site for my computer

Height: 38.7 cm (15.23 inches)
Width: 17.5 cm (6.89 inches)
Length: 41.4 cm (16.29 inches)

This is a link to my old motherboard

In the big pictuer Looks like computer is running Ok just loud
if I can get it to make less noise that would be great but if not will
just have to live with it until next computer and shut it down every night
so it will not keep me awake. will look at all you guys options and see what
happens. But thanks for feed back either way.

a c 120 à CPUs
June 18, 2011 9:19:37 PM

If the shop installed a new mobo,
I'd hazard that they used the original heatsink, maybe they changed the paste, maybe (most likely) they didn't,
I'd contact them for confirmation and ask about them cleaning and reseating the heatsink with some fresh thermal paste

Best solution

June 19, 2011 3:36:46 AM

No need to live with a loud fan. Even inexpensive heatsinks are better than oem.
Simplest is to replace heat sink fan with one that can be motherboard controled.

First though try downloading Speed Fan and CPUZ, these are software applications that monitor temperatures and fan speed, and can control fan speed with some motherboards.
If you are experiencing high temperatures the shop has screwed up or motherboard sensor is bad.
Check with motherboard manual, but usually hitting the delete button on first post of screen will enter BIOS.
Use arrows to go up or down or side ways. PC HEALTH should disply temperature.
There may also be a SMART FAN controller to enable.

Shops are notorious for fast and sloppy work (the more quickly done, the more jobs they can charge for). Keep on them, this is NOT acceptable.

June 19, 2011 12:55:00 PM

wil check the heat in case the room it is in has good AC and room stays cool computer is not in a cabinet or anything in wide open space so unless the shop did do bad install do not think it is running hot and not running any apps , games, photo editing ect. just little internet surfeing spreadsheets. ect.
I did not know you could download software to control fan have not had this problem in past have build 2 or 3
compters but still a novice for most part will get another fan and check out some software, and look at mobo spec. This one is real loud have to close door even when useing compter noise is a pain in the ear. I use laptop most of time in different room most of time this is just a backup but still need to kill the noise now that I have
some things that may help will try them till I hit right combo , fan , software ect. again thanks for all you guys help as I said still somewhat of a novice in the big picture. so all feedback is welcome.
Have a great day and thanks
June 19, 2011 2:37:05 PM

Went to mobo site and download Bios PDF file showing Bios settings hare is the Link

Found a section with these setting choices do you think this is fan setting section I am alway careful while in bios as not to mess anything up am on laptop now will go take a look it looks like auto is the Default so looks like it is turned on. ?? If it give me a temp Range what low temp. and High Temp range should it be set to ? will keep looking and thanks for all the info

(AMD K8 Cool&Quiet control
The item allows you select K8 Cool’n’Quiet control.
The Choices: Auto (default), Disabled.
The Choices: 00 (default); Min=0000, Max=001B, key in a HEX number.)

CPU Smart Fan
This item allows you to control the CPU Fan.
The Choices: Disabled (default), Auto, 4-pin, 3-pin..
Smart Fan Calibration
Choose this item and then the BIOS will auto test and detect the CPU fan
functions and show CPU fan speed.
PWM Duty Off<℃>
If the CPU Temperature is lower than the set value, FAN will turn off.
The Choices: Min=0,.Max=127, Key in a DEC number.
PWM Duty Start<℃>
CPU fan starts to work under smart fan function when arrive this set
The Choices: Min=0,.Max=127, Key in a DEC number.
Start PWM Value
When CPU temperature arrives to the set value, the CPU fan will work
under Smart Fan Function mode. The range is from 0~127, with an
interval of 1.
The Choices: Min=0,.Max=127, Key in a DEC number.
Smart Fan Slope
Increasing the value of slope PWM will raise the speed of CPU fan.
The Choices: Min=1,.Max=127, Key in a DEC number.
Shutdown Temperature
This item allows you to set up the CPU shutdown Temperature. This item is
only effective under Windows 98 ACPI mode.
The Choices: Disabled (default), 60℃/ 140℉, 65℃/ 149℉, 70℃/ 158℉, 75℃
/ 167℉, 80℃/ 176℉, 85℃/ 185℉, 90℃/ 167℉.
Show H/W Monitor in POST
If you computer contains a monitoring system, it will show PC health status
during POST stage. The item offers several different delay times.
June 19, 2011 5:13:05 PM

am looking at my Bios now got down to (CPU Smart Fan) changed to Auto
next choice is (Smart Fan Calibration) (Press Enter) when I do a screen comes up says
Max Fan Speed 4166 RPM
Max PWM Value 105
Min Fan Speed C923 rpm
Min PWM Value 22

It move throuhg the Differnet speed on its own and does slow the fan down
to 2 or 3 slower speeds and a whole lot quiter but after is runs through the process
the fan go back to High speed in this window it dose not seem to let you adjust anything
at the end it give (Suggest Value) in this case (Start PWM Value 38) (Slope PWM 13)
Press any Key to save
Saved the Value per what it said once out of that screen fan returns to high speed
computer has been on but not used so not sure if running warm causeing fan to run
high or not getting setting to save.

Just restarted computer fan speed has dropped off to much slower speed and way less
noise . setting must have not started until windows reloaded. ]I guess it will adjust itself
as needed per heat sensor? And by running at the lower speed should be OK heat wise?
will watch and listen. I think this may have fixed it will see. What temps would be in the
high range to watch for ? I guess there is not a low temp. range cooler ther better?
again lean something and thanks . again for all the feedbaack has helped me alot.
a c 120 à CPUs
June 19, 2011 5:27:25 PM

it should regulate itself so if its hot, it runs faster, if its not working too hard, it slows down yes
June 19, 2011 8:38:46 PM

Looks like problem is fixed thanks everyone for your help running at normal fan speeds and!not to loud at all !! !
!Thanks alot By the way how do you edit the header to (problem solved) as I have seen on some post. will look around on how
Rick :bounce: 
June 19, 2011 8:47:30 PM

Best answer selected by rbaggett01.