A guy suggested to use the freeware RivaTuner which he said was able to reduce the fan speed of my video card by altering the fan speed directly. This was the solution I was looking for. I quickly downloaded and installed Rivatuner. The only thing left was to lower the fan speed and make the changes permanent.

I clicked on customize in the first screen that appeared right next to Forceware detected and selected the icon for system settings from the panel. The second tab was named fan, the goal of my search. I was able to define a fan speed value for three different states: standard 2D, low power 3D and performance 3D. I changed the settings from 100% to 25 in standard 2D mode, 50% for low power 3D and 100% for performance 3D. 2D means everything that you do normally in windows like using office, surfing the internet or writing an email.

I checked the box that saved the settings and applied them at every system start and voila – the noise was gone. From one second to the next it was gone. My pc is almost silent now, the noisiest part is my external hard drive, everything else is almost silently. (I bought a low noise cpu fan and power supply).

I suggest you take a look at Rivatuner if you face a similar problem like I did. It might solve yours too

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