How to fix PCIe bandwidth bottlenecks on Vastarmor RX 9070 XT?
Riding through the wilderness was ruined by these random hitches that totally killed the immersion. My sequential read speeds were only hitting 3200 MB/s, which happened because the motherboard mistakenly negotiated the PCIe link at Gen3, creating a massive I/O bottleneck when the CPU tried to pull 4K textures. I tried the High Performance power plan first, but that did absolutely nothing for a physical link bottleneck—the stutters stayed exactly the same. I finally went into the BIOS and forced the PCIe slot to Gen4 mode and updated the chipset drivers. Suddenly, read speeds jumped to 7200-7600 MB/s, and the scene transitions became buttery smooth. I actually had two failed POST boots after forcing Gen4, which I only fixed by slightly dialing back my XMP profile. Now the GPU stays at 64-70℃ and is running perfectly. Benchmarks confirm the bandwidth is finally maxed out, with frame times locked at 5.1-6.4ms.
