Why does Alan Wake 2 flicker on Galax H410M Shadow board?

Light flickering ruined my immersion. I tried locking frequency, but it overheated to 90℃. I used GamePP Power Plan Switcher for High Performance. Cinebench R23 hit 18000 points, and CPU held 4.1-4.2GHz per GamePP. Temperature stayed at 78-82℃ via AIDA64.