My WD SN850 2TB is hitting random read errors causing texture tearing in combat. Why this?

Mid-combo, the floor textures just rip open into black blocks. I honestly wondered if the SN850 was trying to be 'artistic' with the glitches. It was a total nightmare. I tried updating GPU drivers, but the tearing stayed and started flickering—a complete waste of time. I ran IOmeter for a stress test and found 4K random read spikes over 250ms. I jumped into the BIOS, forced the PCIe slot to Gen 4 instead of Auto, and killed all power-saving modes. After that, response times flattened to 0.06-0.09ms, and the tearing vanished. I did have a moment where my peripherals stopped working after the BIOS change, but re-seating the PCIe expansion card fixed it. Temps are 50-56℃ with the controller at 75% load. I exported all the I/O error logs from Event Viewer for the records.