Overview

• Reports from DLSS Swapper’s GitHub and social feed indicate a manual DLL replacement can make FSR 4 appear in the upscaler options of games that natively support FSR 3.1.
• The method relies on AMD’s latest FidelityFX SDK and a simple rename/import of signed DLLs using tools like DLSS Swapper, echoing long‑standing DLSS version swaps.
• Early tests suggest the swap requires a Radeon RX 9000‑series GPU and will otherwise fall back to FSR 3.1.5, with some users noting the trick does not trigger under Linux.
• A screenshot from Horizon Zero Dawn: Remastered shows FSR 4.0.2 listed after the swap, though editors caution it is unclear whether the game actually executes FSR 4 code or merely displays the DLL version.
• OptiScaler previously enabled similar swaps, and DLSS Swapper’s developer says the approach appears to work, with few crash reports and easy reversibility when using vendor‑sourced files; AMD has also signaled future driver updates may add FSR 4 to select games.