How do I prevent GPU throttling in MX vs ATV Legends with a Deepcool AK500 Ice Cube?

My GPU frequency dropped from 2400MHz to 2100MHz during mud races, causing visible stutter. I tried adding more case fans, but the effect was minimal and the temps stayed high. I then used the GamePP Hardware Sensor Page to adjust the fan curve and optimize airflow. The frequency held at 2350-2400MHz, and temps stayed at 72-75℃ per GamePP Benchmark Verification. The racing is smooth now.