Thanks for the replies
We just installed a new ssd in the system with windows 8 on it.
uninstalling CCC and installing the driver didn't work, the fan still spins at full speed.
Is there something else we can do?
The whole pc is dust free since last week so that's not the problem
Edit:
To sum up the current situation: we just reinstalled windows and we still can't change the fan speed manually,
is there something like a GPU bios that can be messed up in some way?