The simple and initial reaction is that the processor isn't the best for the games you're trying to run to meet your expectations.
To check whether is anything wrong I would suggest downloading AMD Overdrive, to check the thermal margin on a full load. The lower the thermal margin the closer the processor is to overheating. Technically, a positive value indicates being safe but, I believe, ideally it should be over 10 deg C.
The other is to download something like MSI Afterburner to check other factors like CPU, RAM and GPU usage and temperatures to see if there's anything else going on.
Depending on situation, basic housekeeping like virus and malware scans could be considered and if there are other processes running (use Task...