How to fix memory scheduling on Sapphire Pure Polar RX 9070 XT?
While building a massive base, my Sapphire Pure Polar card hit a wall with static meshes, and the VRAM clock was jumping wildly between 2400 MHz - 2600 MHz. It was a nightmare—FPS plummeted from 110 down to 42 in a heartbeat. I first tried enabling Enhanced Sync in the driver, but that just bloated my input lag to 22 ms without fixing a single stutter. I felt completely lost. Eventually, I used a tuning tool to lock the memory clock at 2750 MHz. Monitoring via HWiNFO showed the core temp staying between 64℃ - 69℃, and the frame time finally tightened from 11.5 ms down to 8.2 ms. I initially suspected I was out of VRAM, but GPU-Z showed usage was only 11.2 GB - 12.8 GB; the real culprit was the sluggish frequency scaling. After a second attempt where I undervolted the core to 1.05 V, the card finally stayed in a high-frequency state, and the responsiveness came back instantly. I ran a stress test to verify the load curve, and the efficiency peaked at 310 Watts. Those random micro-stutters are gone now, with frame times rock steady at 8.2 ms - 9.1 ms.
