How to fix storage I/O stutters on Onda A520-VH-W in Horizon Zero Dawn?
Whenever I'm sprinting across the wasteland, I get these anxiety-inducing frame drops that happen right when the game is streaming in new assets. The Onda A520-VH-W is limited to PCIe 3.0, and modern engines just eat I/O bandwidth for breakfast, leading to 4K random read latencies of 90-130ms. I tried turning off all environmental shadows, which gave me a measly 6 FPS boost but didn't touch the stuttering—it was a pretty frustrating loop of trial and error. I eventually updated to the latest NVMe drivers and forced 'Ultimate Performance' in Windows to stop the CPU from dipping into low-power states, which reduced the I/O wake-up lag. CrystalDiskMark showed random reads climbing from 45MB/s to 62MB/s, and the stutter frequency dropped significantly. I actually accidentally wiped my chipset drivers during the process and lost my internet for a bit, which was a total facepalm moment. CPU temps sat at 68-75℃ and VRMs were around 60-65℃. The internal profiler shows I/O latency is way down, and the game finally feels snappy to the touch.
