Why does Metro Awakening keep having timing instability and frame jumps with Kingston Savage DDR4 2400?

Cruising through those dark metro tunnels, I kept hitting these micro-stutters that were driving me insane. It was bizarre because my Kingston Savage DDR4 2400 was idling cool between 38-44℃ and the clock speed was rock steady. I tried bumping my virtual memory to 32GB first, but the frame drops didn't budge, which left me totally clueless. I eventually dove into the BIOS Advanced mode, manually crushed the tRFC timing from 560 down to 480, and locked the VDD voltage at 1.35V instead of the default 1.2V to tighten up the signal integrity. Checking the RTSS overlay, my frame times stopped jumping wildly between 12.5-28.3ms and settled into a clean 8.1-11.5ms range. I actually hit a wall early on when I tried pushing tRCD too low—the system just black-screened and rebooted the moment a map loaded. I had to back it off by 2 units before it finally behaved. Memory usage stayed around 5.2-7.4GB with the memory controller barely breaking a sweat. A benchmark run confirmed latency dropped from 82ns to 74ns, and the frame delivery is now a consistent 8.1-11.5ms.