AMD FSR 4.1 Leak Suggests Quiet Driver Testing Behind the Scenes

AMD’s FSR roadmap has remained unusually quiet in recent months, especially around FSR 4 and the Redstone feature set. Now, a new leak suggests the company may be testing an updated FSR 4.1 build behind closed doors.

According to VideoCardz, a recently surfaced DLL file, amdxcffx64.dll, appears linked to FSR-related driver functionality. The file reportedly comes from an unreleased Radeon Adrenalin 26.2.2 driver build.

Leaked Driver Points to FSR 4.1 Work in Progress

The build in question is said to belong to AMD’s invite-only Vanguard beta testing program. That suggests the software remains in early internal testing rather than nearing public release.

Early user comparisons highlight minor image quality tweaks. Some testers report improved foliage detail and slightly better stability in complex scenes. However, performance appears largely unchanged compared to previous FSR 4 builds, based on limited early benchmarks.

Due to the restricted nature of the leak, broader validation across engines and titles remains incomplete. Community testing has not yet confirmed consistency in motion clarity or artifact reduction.

Experimental Testing on Unsupported GPUs

Interestingly, a Reddit user reportedly tested the leaked DLL on a Radeon RX 7900 XTX — a GPU that does not officially support FSR 4. That raises questions about whether AMD is experimenting with broader hardware compatibility or if this is simply a byproduct of driver-level testing.

Some users have attempted to inject the leaked file using third-party tools such as OptiScaler. While the DLL reportedly carries a valid digital signature and does not immediately trigger security warnings, using unofficial binaries carries real risks. These include driver instability, Windows integrity check failures, and potential security vulnerabilities

As of now, FSR 4 remains tied to RDNA 4 hardware. AMD has not announced plans to expand official support to earlier RDNA generations.

The leak does not confirm any imminent public release. Instead, it suggests AMD continues refining FSR internally while keeping its next steps under wraps.

In related developments, AMD recently introduced Ray Regeneration support for Crimson Desert. Meanwhile, despite broader GPU price hikes across the market, reports indicate Radeon RX 9000 series cards may see price adjustments due to softer demand.