Modders Find a Way to Enable FSR 4 in Any Game — But Not Without Risks

The modding community has made a breakthrough, enabling gamers to use AMD’s FSR 4 upscaling technology even in games where it’s not officially supported. Thanks to a tool called OptiScaler, initially developed to replace existing upscalers, enthusiasts have managed to integrate FSR 4 into projects that support DLSS 2/3 and Intel XeSS. This is especially significant for owners of the latest Radeon RX 9000 (RDNA 4) graphics cards, who have so far been able to use FSR 4 in only 35 titles.

OptiScaler acts as a “bridge” between technologies: it replaces DLSS or XeSS files with FSR 4, automatically adding support for the latest version. The tool also experimentally introduces frame generation and Anti-Lag functionality through NVIDIA Reflex, extending its capabilities beyond simple upscaling. For instance, in Cyberpunk 2077, where developers have declined to update FSR to version 3.1, modders are already showcasing FSR 4 in action with improved detail and more stable image quality.

Despite its potential, OptiScaler remains an unstable solution. Windows 10 users report crashes and errors when launching modified games. Additionally, the tool requires deep modification of project files, which could trigger anti-cheat systems in multiplayer titles. Developers caution that the list of supported games is growing gradually, and some games fail to launch altogether.

The situation surrounding FSR 4 raises questions about the accessibility of exclusive technologies. While Microsoft is working to standardize upscaling through DirectSR, OptiScaler shows that the community is willing to take matters into its own hands. However, a key barrier remains — FSR 4 is tied to RDNA 4. Enthusiasts hope AMD will relax these requirements, allowing the technology to work on older GPUs, even if it means reduced quality. For now, OptiScaler remains the only link between gamers and FSR 4 — fragile, but promising.