How to stop lighting flicker caused by heat in Hellblade II?

Forest scenes in Hellblade II were flickering due to GPU heat hitting 72-78℃. I added extra fans first, but the noise was unbearable and airflow stayed chaotic. I used GamePP Hardware Sensor to map temps, then added a third front fan and boosted rear speed by 20%. 3DMark tests showed temps dropping to 65-68℃. CPU stabilized at 60-65℃. The flicker is gone, and this setup is the fix.