AMD’s FSR 4 has reportedly been enabled on a Radeon RX 6800 XT GPU, which is based on the RDNA 2 architecture. This development follows several users successfully enabling the new technology on older and unsupported (officially) GPUs using modded DLLs.

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After the AMD FSR 4 source code leak a few days ago, users managed to enable the new tech on various older GPUs, including the Radeon RX 7000 series from AMD and NVIDIA’s RTX 30 series. The leaked files were modified to support the INT8 version of FSR 4 instead of FP8, which runs on many non-RX 9000 (RDNA 4) GPUs due to their instruction set compatibility.

One user from Chiphell Forums enabled FSR 4 on his Radeon RX 6800 XT. In testing, the title “Stellar Blade,” which supports FSR 3, saw improved visual quality with a custom modded DLL enabling FSR 4.0.2 in game mode “Model 3.” However, there was a noticeable performance hit; while the game achieved over 110 FPS with FSR 3 Quality mode, it dropped to around 100-107 FPS with FSR 4 Quality Mode.

The user noted a 10-20% drop in performance, which is significant but manageable for games running above 100 FPS. Enabling FSR 4 on older GPUs results in greater performance loss compared to FSR 3 due to lack of official support or hardware compatibility. For example, Radeon RX 9000 GPUs experience a slight hit (2-4%), while RDNA 3 GPUs see around a 7%-10% drop.

The biggest impact is observed on RDNA 2 GPUs, which saw the reported 10-20% performance loss due to the exclusion of WMMA instructions. This forces RDNA 2 GPUs to use alternative hardware functions like DP4a or Integer units for matrix operations.

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October 8, 2025

With the source code leak, many users believe AMD plans to release FSR 4 publicly on older GPUs, potentially offering better support than the custom modded DLLs currently available.