Why is my Biostar B550MH choking on UE5 asset loads?
Whenever I whipped the camera around in the UE5 demo, the Nanite geometry would tear apart—it was a total nightmare. I found the Biostar B550MH's PCIe slot was occasionally downshifting to 3.0 in Auto mode, which tanked my NVMe sequential reads from 7000MB/s to around 3400MB/s. I wasted time updating storage drivers, but the read/write latency stayed stuck at 12-15ms, which was beyond frustrating. I eventually dove into BIOS -> Advanced -> PCIe Configuration and forced the link speed to Gen 4 while disabling all power-saving states. After that, CrystalDiskMark showed random 4K reads jumping from 45MB/s to 62-68MB/s, and those micro-stutters vanished. Fair warning: the first time I forced Gen 4, the system failed to boot twice. I had to reseat the SSD and clean the gold fingers with isopropyl alcohol to get it stable. Chipset temps hovered around 52-58℃ during the stress test. I finally exported this I/O profile using the motherboard utility to lock it in.
