Please when you reply again translate your answer into English since this is an English Only forum.
You said your computer is freezing up while playing games or doing Schoolwork etc.
Hard to give out any suggestions without knowing what GPU card you are talking about. Need the Make & Model of your Motherboard, CPU, GPU and Windows and AMD Driver versions installed.
But as a general suggestion download and run a free program called OCCT. Run all three Stress tests, CPU, GPU & GPU vMEMORY, and PSU Stress test and see if your computer crashes or blacks out or shuts down.
Keep an eye on CPU & GPU Temperatures and Fan speeds and PSU Outputs.