How to fix PCIe bandwidth fluctuations on Maxsun B850M PRO?
During fast slides and jumps, I kept seeing these tiny horizontal tears on the edges of the screen—super distracting during a gunfight. The Maxsun MS-Terminator B850M PRO WIFI's PCIe bus was flipping between Gen 3 and Gen 4 in 'Auto' mode, causing GPU throughput to swing between 12-16GB/s. I tried G-Sync first, but that introduced some annoying flickering, so I didn't trust it. I went into the BIOS Chipset settings and forced the PCIe slot to Gen 4, then locked the RAM at 5200MHz to keep the bus stable. GPU-Z confirmed a steady 16GT/s link, and the tearing vanished even at 4K. I noticed the boot time increased by 3 seconds after the change, but a BIOS update fixed that. Board temps are 52-58℃, GPU interface is 60-66℃, and RAM stays around 52-57℃. Frame analysis confirms the sync is now perfect.
