In this tutorial, we will see how to adjust GPU fan speed for Nvidia graphics cards under Ubuntu or Linux Mint. Make sure you have already installed your Nvidia driver. The tutorial will give you two methods, the first one is done by adding the Coolbits component, and the second one is done with nvclock.
Use this tip at your own risk.

Method 1

Open the termianl and run these commands:

sudo nvidia-xconfig 
sudo nvidia-xconfig --cool-bits=4

Reboot your system and open NVIDIA X Server from Unity dash. You will find an extra Thermal Settings entry has been added where you can adjust GPU fan speed using the slider:

If nothing appears, try this alternative method:

In the termianl, run this command to edit xorg.conf file:

sudo  gedit /etc/X11/xorg.conf

Add Option "Coolbits" "4" as follows:

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 570"
Option "NoLogo" "True"
Option "Coolbits" "4"

If you have more than one device, add Option "Coolbits" "4" to each section as above. Save your file and exit.

Method 2

You can control GPU fan speed for a Nvidia graphics card using nvclock. You can install it with this command:

sudo apt-get install nvclock

To change GPU fan speed, write this:

nvclock -f -F 70 

Your fan speed will run at 70%. Change 70 to any speed you want. 

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