How to fix the Sapphire RX 9070 XT scheduling stutters in Final Fantasy XV?
While driving through the city, the game had these rhythmic micro-pauses, like a film strip skipping a frame. The memory clock on my Sapphire PULSE RX 9070 XT was fluctuating between 2.1GHz and 2.3GHz, and during complex lighting scenes, the driver scheduling latency hit 18-22ms, leaving the CPU idling while waiting for the GPU. I first tried disabling all overlays, but the stuttering barely changed, which told me I needed to deal with the driver's clock strategy. I went into the AMD Adrenalin software, manually locked the memory clock to its maximum frequency, and switched the Windows Power Plan to 'Ultimate Performance.' Looking at the RivaTuner frame time graph, the peaks dropped from 42ms down to a tight 12-15ms. The only catch was that idle power draw jumped by 12W, so I had to set up a custom downclocking curve for low loads. GPU temps are sitting at 66-72°C, and after four hours of testing, the 2.3GHz clock is rock solid.
