View Full Version : Cooling Fan Noise

bk T
14-12-2005, 08:43 AM
Just added a small little cooling fan to my old PIII box. It works Ok except that it produces a high-pitch noise which is quite annoying.

What's the remedy?


14-12-2005, 09:27 AM
Not to sure but i'll chuck some ideas that may help your way....

I supose youv'e tried oiling the bearings?

Maybe you could wire up a govener(?) type control to slow it down so it doesnt spin so fast.

Maybe another fan?

14-12-2005, 09:50 AM
Look here (http://www.dansdata.com/fanmaint.htm)

14-12-2005, 10:18 AM
Well there are 3 possibilities:

1) Fit a similar sized fan which has a lower rpm setting. You may have to sacrifice CFM for low noise.

2) Volt mod the current fan to 7V (http://www.ocforums.com/showthread.php?t=372297), this will make the fan spin slower and thus it will be a lot quieter (again at the expense of CFM)

3) Install a bigger fan. 120mm is recommend (these fans spin at low rpm but they still move larger amounts of air than the smaller 80mm or 92mm fans) The 120mm fans provide a good balance between effective cooling and low noise operation.

Hope that helps

14-12-2005, 10:45 AM
I just had the CHA fan start to make noise today, and it kept me from booting. The sensor would shut the boot off after a few seconds..but I still heard something noisey for the few moments it was trying.

I took the side case off..hit the power and found out which fan was making all the noise..removed it and gently pulled off the foil cover on the back of it. I placed two tiny drops of sewing machine oil on the bearing using a toothpick to place it where I wanted and re-installed it. It's running quietly and happily..so am I..er...happy that is.

Maybe it was due for an oil change anyway. :D