How to fix PCIe bandwidth fluctuations on Jginyue X99M-PLUS D4?
Whenever I hit the fast-travel jump between star systems, these tiny but annoying tearing lines would rip across the center of the screen. On a compact ITX board like the Jginyue X99M-PLUS D4, the PCIe lanes get into a nasty fight between the GPU and the NVMe drive, causing VRAM data transfer latency to swing wildly between 18-32 ms. I tried enabling Low Latency Mode in the drivers, but that was just a band-aid; the tearing stayed. I ended up going into the BIOS, forcing the second M.2 slot to Gen3 mode, and manually setting the primary PCIe slot to the highest priority. Checking the RTSS frametime graph, those jagged spikes were completely flattened, and frame generation stabilized at 12-15 ms. I did have a moment of panic when I disabled a port and my second SSD vanished from the system, but a quick boot-order reconfiguration fixed it. The chipset temperature now stays between 58-65°C. After side-by-side testing, the tearing is gone, and the system feels balanced.
