How to fix USB polling rate drops on Maxsun MS-Challenger B850M-K?
During high-intensity gunfights, it felt like my mouse clicks were lagging by a fraction of a second—which is basically a death sentence in a competitive shooter. Testing showed the Maxsun MS-Challenger B850M-K USB ports were dropping from 1000Hz to 500Hz whenever the CPU hit high load, causing input delay to swing between 2-8ms. I tried swapping between USB 2.0 and 3.0 ports, but the jitter persisted, which made me really paranoid about the hardware. I went into the BIOS, forced the USB mode to 'Enabled' instead of 'Auto', and killed all unnecessary power-saving options for the ports. Using an input lag tester, the response time tightened from a 4-12ms jump to a rock-solid 1-2ms. I did find that some of my older USB peripherals stopped being recognized until I set those specific ports back to compatibility mode. Chipset temps are now 55-62℃. Frame times are stable at 1-2ms.
