Why is God of War: Ragnarok stuttering with G.Skill Trident Z RGB DDR4 4000?

Combat stuttered as GamePP showed memory locked at 2133MHz. I tried manual overclocking, but hit a blue screen. I enabled the XMP profile via GamePP Hardware Sensor Page to reach 4000MHz. Bandwidth utilization rose from 45% to 82%, and frame rate stabilized at 110 FPS. This frequency switch restores the intended performance of your RAM.