Are you sure your ambient room temperature is 77°C? Do you mean load or something else?
Anyway, I suggest you run Prime 95 and download Real Temp. Run Prime 95 and make it use all cores, and see the temperatures that you get to after 10 minutes, and use Real Temp to monitor those temperatures. You should ensure that the temperatures are below 75°C ± 5°C. If they're a bit hotter than usual, then I'd make sure that there is decent airflow in the case, and that you have properly mounted the HSF.