My Maxsun MS-Challenger B850M-K has bandwidth swings causing lag in Dota 2 team fights, how to fix?

The micro-stutters during team fights are absolutely brutal, especially when you're trying to land a crucial spell and the screen just freezes for a split second. After digging into the logs, I found that the PCIe slot on the Maxsun MS-Challenger B850M-K was defaulting to 'Auto' and occasionally dropping back to Gen 3.0, causing VRAM data transfer to swing violently between 12-18GB/s. I first tried lowering the global graphics settings in the driver panel, but that just made the game look like a pixelated mess, which was a total dealbreaker. I went back into the BIOS Advanced Bus settings and forced the PCIe speed to Gen4, then slammed the latest AMD chipset drivers. Checking GPU-Z in real-time, the bus interface finally stayed locked at x16 4.0. It was a bit of a struggle at first—the system failed to recognize my SSD twice right after the change, but disabling the storage controller's power management fixed it. Now the VRM temps stay between 58-64℃ and the memory is stable at 58-63℃. No more interface swings, just pure stability.