An unreleased AMD Adrenalin graphics driver is making waves after a new FidelityFX Super Resolution file reportedly surfaced inside it. According to forum posts, a test build of AMD’s Adrenalin 26.3.1 driver—said to be part of an invite-only beta—includes an FSR 4.1 DLL, and early experiments suggest it can be made to run on RDNA 3 graphics cards when paired with Proton FP8 emulation on Linux.
The leaked file is labeled “amdxcffx64-v2.1.0.968(4.1.0)”, and users who tried it claim performance is essentially the same as FSR 4.0.3 on a Linux setup using Mesa 26.1.0. While the initial uploader didn’t provide a full side-by-side visual breakdown, that hasn’t stopped others from jumping in to test image quality differences across real games.
One user detailed a straightforward way to enable the new upscaler by replacing the existing “amdxcffx64.dll” in the Windows System32 directory with the leaked FSR 4.1 DLL. They also mentioned it can be toggled using OptiScaler, but said a direct DLL swap works fine. In practice, the swap appears to be recognized in-game: one shared setup screen for The Last of Us Part II shows “FSR 4.1.0” listed as an anti-aliasing mode, suggesting the method is functional even on older supported hardware like the Radeon RX 7900 XT.
Early comparison screenshots give a glimpse of what FSR 4.1 might change visually versus FSR 4.0.3, particularly in Ultra Performance mode. In Hogwarts Legacy, one set of images shows slightly stronger sharpening with FSR 4.1. Another comparison looks more dramatic, with noticeably sharper foliage and clearer fine detail in elements like a tree trunk and a character’s outfit, though the wall texture in the same scene doesn’t appear to improve as much.
Not every game shows a clear upgrade. In Monster Hunter Wilds, one shared comparison suggests FSR 4.1 looks very similar to FSR 4.0.3, with only minimal changes. Even so, some users report they’re seeing a meaningful bump in image quality with the newer version, which could indicate the benefits vary by game engine, scene complexity, and tuning.
The bigger question now is how FSR 4.1 will perform in the presets that matter most to everyday play—especially Quality and Balanced modes. Those profiles tend to be the make-or-break options for gamers who want a cleaner image without giving up too much performance, particularly on RDNA 3 GPUs where users may be deciding between newer FSR branches and alternatives like FSR 3.1.
One important caveat remains: even if FSR 4.1 can be forced to run through workarounds, it’s still not expected to be natively supported on RDNA 3. For now, this is firmly in the “at your own risk” experimentation category—but it’s another sign that newer upscaling tech can sometimes be coaxed into working on hardware that wasn’t originally meant to get it.
