Hello there! I am Charity, I'm an Independent Advisor. I'm glad to help you today!
I'm really sorry that happened to you. May I ask if you have monitored your temperature while playing games? AMD FX CPUs can experience thermal throttling. Also, please ensure your power supply unit (PSU) is adequate and stable Since you're using an older computer, it's possible that your power supply has degraded. I would suggest trying a different power supply to isolate the issue.
Please let me know if you have any more questions, I'll do my best to respond as soon as possible.
Kind Regards,
Charity
Please note that things might need more than one reply to completely resolve your issue, as it will completely depend on the complexity of the question and the amount of detail that you have provided me.