In order to determine which component is causing the crash (CPU or GPU) 

1. Download Core temp or any other temperature monitoring utility 

Open Supportassist > Troubleshooting > I want to troubleshooting my PC > Scan a specific piece of hardware > Processor > Stress Test.  Let it run for 10 minutes or more and check the temperatures of CPU side by side 

2.Supportassist > Troubleshooting > I want to troubleshooting my PC > Scan a specific piece of hardware > Graphic card (Choose AMD ) > stress test. 

3. Perform the same test on memory 

Share the temperature's. If either of these tests result in a crash, you will find the component responsible.