Optimizing storage throughput on Onda 9D4-DVH
The frame rate would suddenly dive to 20 FPS, turning the game into a slideshow. It was honestly ridiculous. The PCIe bus on the Onda 9D4-DVH was having a meltdown trying to handle concurrent requests from the NVMe drive and the GPU, leading to 15-25ms of contention latency. I wasted time updating every single Windows driver, but the bandwidth utilization was still jumping all over the place. I eventually went into the BIOS, changed the PCIe link mode from Auto to a forced Gen 3, and disabled all the useless power-saving ports. AIDA64 bandwidth tests showed read speeds jumping from 2100MB/s to over 3200MB/s. The hitching during scene transitions completely vanished. I did notice a slower boot time (about 8 seconds longer) after the change, but a manual microcode update sorted that out. Core temps are steady at 45-52℃ and the fans are humming along at 1400-1600RPM.
