Fixing bus latency on Onda A520-VH-W for RDR2 4K MODs
With 4K ultra-HD textures, the world looks insane, but I was getting a micro-stutter every 10 seconds, which made me really cautious about the hardware. The bus bandwidth on the Onda A520-VH-W was hitting 15-30ms of scheduling latency when handling those massive 4K assets, creating a huge bottleneck for VRAM data. I tried lowering the texture filtering, but that just killed the whole point of using a 4K MOD—not an option. I went into the BIOS and locked the PCIe link speed to Gen3 Stable mode and disabled every useless background I/O service in Windows. Using a latency analyzer, the bus response time dropped from 25ms to about 8-12ms, and the smoothness improved massively. I had a brief issue where the system didn't recognize the drive on the first boot after the change, but resetting the boot order fixed it. Board temps are steady at 48-55℃. After 8 hours of heavy lifting, no more hitches, though I suspect this board is at its absolute limit.
