How to fix PCIe link synchronization on Biostar B650MT?
Every time I flicked the camera, a massive horizontal tear would rip through the screen, which was honestly making me dizzy during fast fights. It turns out the PCIe 4.0 link on the Biostar B650MT had a sync deviation of 12-18ms, meaning the GPU output and monitor refresh were totally out of whack. I first tried 'Enhanced Sync' in the drivers, but while the tearing stopped, my input lag jumped to 60ms—it felt like I was playing underwater, which was just depressing. I eventually went into the BIOS, changed the PCIe slot speed from Auto to Gen3, and used RTSS to cap the frame rate at 141 FPS to fit my 144Hz monitor's cycle. Looking at the frame time graphs, the intervals finally stabilized at 6.8-7.2ms and the tearing disappeared. I did lose about 20% of my SSD sequential read speed after forcing Gen3, but updating the NVMe drivers helped a bit. The chipset temp stays around 50-56℃ and RAM usage is steady at 12-15GB. The input response is finally snappy again.
