Remarkably, gamers do not require Radeon RX 9000 GPUs to take advantage of AMD’s FidelityFX Super Resolution (FSR) 4 technology. A DLL unintentionally distributed by AMD is effectively enabling FSR 4 functionality on a broader range of hardware.
How AMD’s Accidental Release of FSR 4 Int8 Files Enhances Graphics for RDNA 3, RDNA 2, and RTX 30 GPUs
In a surprising turn of events last month, AMD inadvertently published the complete source code for FSR 4, its cutting-edge upscaling technology that significantly outperforms FSR 3.1 in visual fidelity. While FSR 4 is specifically designed for RDNA 4 architectures, commonly referred to as Radeon RX 9000 GPUs, the company has also released an update for its Adrenalin software to support FSR 4 in games with native FSR 3.1 functionalities. However, this update is limited to users owning RDNA 4 graphics cards.
I got it working, 7% performance delta in CP77 at 1440P with FSR in quality FSR cost went from 0.4ms to 1.2ms – ish @Sebasti66855537
— Beyond FPS (@beyond_fps) September 15, 2025
As it stands, RDNA 3 GPUs are not officially compatible with FSR 4, creating uncertainty about whether AMD plans to extend support to earlier generation graphics cards. One limiting factor is that current RDNA 3 GPUs lack FP8 support, resulting in minor performance regressions. Although there are methods to enable FSR 4 on Linux, doing so entails performance trade-offs due to the necessity for RDNA 3 GPUs to emulate FP8 through FP16.
While enabling FSR 4 on Windows has historically been a challenge, the recent leak of the AMD source code from the open-source FidelityFX SDK included INT8 model files. This release allows previous-gen GPUs—including those in the RDNA 3, RDNA 2, and RTX 30 series—to utilize FSR 4. A Reddit user, u/AthleteDependent926, successfully compiled the FSR 4 DLL using these INT8 files and shared it publicly. Consequently, users are reporting success in substituting FSR 3.1 with the FSR 4 DLL in various titles via Optiscaler on Windows.
The implementation of the FSR 4 DLL has garnered positive feedback from users with both RDNA 3 and RDNA 2 GPUs, who are witnessing dramatic enhancements in visual quality. However, some users have noted an increase in frame processing time, which can result in a performance hit of approximately 6-7 FPS compared to FSR 3.1. Despite this dip, the visual improvements are considerable, as demonstrated by a user who managed to significantly reduce visual artifacts like shimmering grass in Cyberpunk 2077, maintaining a frame rate that was only slightly lower than FSR 3.1 at 1440p with maximum settings and Ray Tracing on an RX 7900 XTX.
To mitigate the performance loss, users can utilize the Balanced mode, which still produces superior visual quality compared to FSR 3.1. It is essential to note that enabling FSR 4 on these GPUs requires Optiscaler, and this functionality is currently limited to single-player games.
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