Unexpected Error (computer restart in graphc intensive game)

Hello, I am a desperate person who just wants to play video games during summer. I recently bought new ram sticks for my computer hoping that my issues would be fixed, yet sadly, I still had unexpected crashes. I cannot play Playerunknown's Battlegrounds or Overwatch without a computer restart. The windows diagnostics say that it was an unexpected restart and I don't know what is wrong. My heating levels are normal or even lower than average and I am optimizing my fans through MSI Afterburner so I don't think overheating is the issue. Anyways whenever I play a game with even slightly decent graphics my computer just restarts, (no blue screen just restarts). Here are my specs:
CPU: AMD FX-6100 3.3GHz Six Core Processor
RAM: Anarchy X DDR3 (2x4GB) 2400 MHz
Graphics Card: NVIDIA GeForce GTX 950
Power Supply: 700 max watt (I'm not sure if it is running at 700 watts or not)

Anyways I need help and if you could point out anything wrong or any problems you could think I have I would appreciate kindly. Please help and have a good day
-Cashton Holbert