How to fix FCLK bus async tearing on Ryzen 9 9950X3D?
During high-speed combat, I noticed these subtle misalignments at the edges of the screen, which is a total nightmare for an action game. The FCLK bus on the Ryzen 9 9950X3D was jumping between 2000MHz - 2133MHz in auto mode, causing memory latency to swing wildly from 65ns - 80ns. I first tried just enabling the EXPO profile, but that led to random memory checksum errors, which made me realize I needed a more manual approach. I manually locked the FCLK at 2100MHz and bumped the memory voltage from 1.35V to 1.4V. Using RivaTuner to track frame times, the interval tightened from a messy 12ms - 25ms to a rock-solid 8ms - 12ms, and the tearing stopped. I did have a crash during a large scene load because the voltage was too low initially, but adding 0.02V solved it completely. CPU temps stayed between 68℃ - 75℃. Ran the internal benchmarks and the frame rate is finally consistent, though the voltage bump is a slight trade-off.
