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As the crash is focused on the GPU, please follow instructions below.
Please uninstall everything of Nvidia using Display Driver Uninstaller and install new drivers from Nvidia
Please note the temperatures of the GPU when idle and under load.
Please make sure the components are clean of dust and connected properly.
Run Furmark to test your GPU. Furmark tutorial
Run Furmark for around 30 minutes
Your GPU temperatures will rise quickly while Furmark is running. Keep a keen eye on them and abort the test if temperatures rise too high