Why is GTA VI frame generation jittering with Crucial DDR4 2666MHz 16GB installed?

Late-stage computation in GTA VI was a mess, with RTSS showing 15ms frame times. HWiNFO revealed 12V voltage dropping to 11.8V. I tried High Performance mode, but it made the voltage dip worse to 11.7V. Using GamePP Resource Scheduler, I set Real-time priority and added a +0.03V offset. AIDA64 confirmed voltage stabilized at 12.0-12.1V, and RTSS showed frame times dropping to 9ms. No more stuttering.