Recently, AMD inadvertently released the complete source code of its FSR 4 super-resolution technology. This allowed tech aficionados to successfully enable the technology on older RX 6000/7000 series graphics cards. An in-depth analysis conducted by ComputerBase uncovered that, due to the limitations of the INT8 integer format (in contrast, the RX 9000 series utilizes the FP8 floating-point format), older graphics cards are outperformed by their newer counterparts in both performance and image quality. Specifically:

When it comes to image quality, INT8 FSR4 performs slightly worse than FP8 FSR4. It shows more instances of object flickering and ghosting, along with unstable leaf rendering. Regarding performance, INT8 FSR4 causes a frame rate drop of roughly 9-13% on older graphics cards. In comparison, FP8 FSR4 only leads to a 3-5% frame rate decrease on newer cards.

Despite these drawbacks, the algorithmic benefits of FSR4 persist. The performance decline on the RX 7000 series is within an acceptable range, while the RX 6000 series is nearing its performance limits.