i5-14600kf

Hi, Just built system on i5-14600kf with ASRock b660m steel legends ddr5 wifi and gettig issues like crushing games, stress test also didn’t pass(The hardware failure). On win 11 got dead screens with critical errors Kernel, on win 10 games are just closing after a while with/w/o any message...

I bought my first desktop computer, and it has an i5-14600KF processor. Idle temperature is around 35 °C, but when I play Black Ops 6 multiplayer for example, the temperature is 75-90 °C, even if I use an aggressive fan curve. Is that too high? Is there a way to lower it? My GPU temperature is...