Why does CPU temp climb during Expeditions: Rome campaigns?

While commanding my legions in long campaigns, I noticed my CPU temperature slowly climbing from 58°C to 81°C per AIDA64 after an hour, causing a slight FPS slide. I tried lowering graphics settings to reduce load, but the visuals suffered significantly while the temperature stayed around 80°C per HWiNFO64, proving I needed more airflow. I entered the GamePP Fan Curve Configuration, bumped the speed to 1400 RPM for anything over 65°C, and synced the chassis fans. Core temperatures stabilized at 66-72°C per HWiNFO64, and memory usage remained steady at 14-16GB per HWiNFO64. Now I can verify