How to calibrate PCIe bus bandwidth for Minecraft RTX on Onda 9D4-DVH?
The voxel world should be a dream with ray tracing, but every time I turned my character, there was this annoying 100ms trail. The PCIe link on the Onda 9D4-DVH was struggling with the massive data throughput of RTX, causing signal retransmissions that made the effective bandwidth oscillate between 6GB/s - 12GB/s. I tried updating the GPU drivers first, but that was a complete waste of time—it didn't fix the lag and actually caused the game to crash on startup. Total frustration. I went into the BIOS and forced the PCIe speed to Gen3 instead of leaving it on Auto, while disabling all motherboard power-saving states. Using a latency tester, the end-to-end response time plummeted from 45ms - 60ms down to 18ms - 22ms, and that sticky feeling was gone. I did notice a brief delay in SSD detection during boot after the Gen3 lock, but switching Windows to High Performance fixed it. The chipset temp stayed around 48°C - 55°C and GPU power hovered at 160W - 180W. The frame time graph is finally a flat line, and the board is running cool at 48°C - 55°C.
