Valve has started folding AMD’s FidelityFX Super Resolution 4.1 into the Proton compatibility layer for SteamOS. The integration targets the upcoming INT8 version of the upscaler, which AMD reworked to run on GPUs that lack FP8 support. Early testing shows the model operates on a Radeon 890M, confirming functional compatibility with RDNA 3.5 hardware.

The leaked DLL was pulled from Valve’s Proton Experimental build after a Reddit user downloaded and ran it through OptiScaler, swapping between FSR versions. Because the file bears a valid signature, games that verify DLL authenticity launch without error. This validates AMD’s conversion of the FP8‑based algorithm to an INT8 pipeline, a step required for RDNA 3 GPUs.

For Linux gamers with laptops or desktops built on the 890M APU, the leak proves that the forthcoming official FSR 4.1 DLL will work out of the box, removing a long‑standing uncertainty. AMD’s workarounds also suggest future updates could extend support to other RDNA 3.5 chips, but the current evidence already guarantees immediate upscaling benefits on existing hardware.

The move underscores Valve’s commitment to keeping SteamOS competitive with Windows‑based gaming, where FSR 4.1 already ships. By delivering a signed, ready‑to‑use DLL, Valve sidesteps the need for users to manually patch their installations. Linux users can now expect smoother performance and sharper visuals on mid‑range RDNA 3.5 devices.