From this site it doesn't seem impossible to mine... And I can limit the usage of the GPU right? Once I used Minergate... Do you suggest using the same program again?
It's not impossible to mine, it's just a question of whether the returns are worth it.
Personally I have not tried it, so I am not sure if you can use Wattman (AMD) or Afterburner (NVIDIA) to control GPU usage.
Minergate is probably an easy way for beginners to start mining. Once you get more experience you can look into mining directly with the pools.