Computer Fan Keeps Speeding Up And Slowing Down

By adjusting the cpu fan smoothing you can made the fans less bursty.

Electric fan sound. It keeps wavering the rpm slightly speeds up for just a second and slows down and then ramps up again in correlation with activity on the desktop and its driving me crazy. Instead of 40 degrees with 25 fan speed and 60 degrees with 65 fan speed the standard figures that were set in the bios i changed it to be faster at. However it seems to have screwed up the cpu fan device driver somehow.

The machine runs fine until it does something heavy on cpu like for example video processing or bulk compiling and then the cpu fan powers up. If you can hear this and it is an annoying noise increase i would venture to say the fans need to be replaced under warranty. However once this happens the fan never stop repeatedly powering up and powering down again.

Since upgrading to the windows 10 anniversary update i noticed a strange occurrence and my cpu fan was always spinning upi ignored it for some time now but it started getting annoying over the. The issue for me was as soon as it went over 60 degrees the new fan speed would kick in and try and drop the cpu temp. Ive had cpu fans go noisy and the answer was to renew the fan with a better quieter one.

The fix for me was to manually change these break points in the bios. Cooling fans do usually speed up and slow down on high end comps. So far so good.

Your cpu fan will likely have an option for a target temperature in degrees celsius and a minimum speed either in percentage or rpm.