Fixing WD Black SN850X 2TB random read latency in Cyberpunk 2077

While speeding through Night City, the game would just freeze for a fraction of a second. It was frustrating, but it gave me a chance to push the SN850X. The random 4K reads were spiking between 18-28ms, meaning the game couldn't fill the VRAM pool fast enough. I started by enabling High Performance mode in Windows power plans, but while the CPU clock went up, the I/O latency didn't budge. I decided to ditch the generic Windows drivers and install the latest official NVMe controller firmware, then disabled Link State Power Management in Device Manager. CrystalDiskMark showed the random read latency drop from 22-30ms to a tight 7-11ms. I did have a couple of slow boots right after the firmware update, but clearing the CMOS cache fixed it. Drive temps are now a stable 42-50℃.
Category:AI Filters Last updated:March 15, 2026 8:54 AM