Why does the Seagate FireCuda 510 cause frame spikes?

Exploring the open world, my FireCuda 510 cache scheduling failed. Frame times jumped to 45ms (RivaTuner). I increased page file to 32GB, but FPS dropped from 78 to 61. I used GamePP Resource Scheduler to set Real-time priority. RivaTuner confirmed 7-12ms intervals. GamePP showed 45-52℃ temps. The game is smooth. I switched power plans.