CachyOS, a performance-focused Linux distribution built for gaming, has released an update to its Proton-CachyOS fork, addressing issues with AMD’s FidelityFX Super Resolution 4 (FSR 4) upscaling technology. The update, Proton-CachyOS 10.0-20260312, restores functionality to the FSR 4 upgrade variable, allowing users to automatically download the necessary amdxcffx64.dll file for improved gaming visuals.
The need for this fix arose after AMD removed most versions of the amdxcffx64.dll file with the release of FSR Upscaling 4.1, leaving the PROTON_FSR4_UPGRADE and PROTON_FSR4_RDNA3_UPGRADE variables without a functional fallback. CachyOS developers implemented a solution to ensure compatibility and continued access to FSR 4 upscaling, initially reverting to FSR 3.1 and then upgrading to FSR Upscaling 4.0, even on AMD’s RDNA 3 graphics cards.
This latest release isn’t just about restoring FSR 4 functionality. CachyOS continues to prioritize performance enhancements and streamlined user experience. The update also includes the default activation of NTSync, a kernel-based synchronization method designed to reduce CPU overhead compared to traditional ESync or FSync. D7VK, a compatibility layer enabling older DirectX games (versions 3, 5, 6, and 7) to run on Linux, has been updated to the latest version, 1.5.
Optimized for Modern Hardware
Proton-CachyOS distinguishes itself from standard Proton through its compilation process. It’s built with specific instruction sets for x86-64-v3 or x86-64-v4 processors, leveraging modern CPU features for potential performance gains. This approach, combined with the default NTSync support, aims to deliver a smoother and more efficient gaming experience on Linux. The distribution also features automated tools for updating upscaling libraries like DLSS, FSR, and XeSS, often ahead of their official integration into standard Proton builds.
Unlike the isolated environment of the Steam Linux Runtime (“SLR”), Proton-CachyOS utilizes native, optimized libraries from the CachyOS distribution itself. This design choice is intended to minimize stuttering and improve overall game stability. Users seeking detailed information on parameters and variables specific to Proton-CachyOS can consult the comprehensive CachyOS Wiki.
What’s Next for CachyOS?
CachyOS’s commitment to providing a cutting-edge gaming experience on Linux is evident in this latest update. The automatic downloader for FSR 4 will continue to seek out and download newer versions as they become available, ensuring users have access to the latest upscaling technology. The combination of performance optimizations, streamlined updates, and a focus on native integration positions CachyOS as a compelling option for Linux gamers.
As the gaming landscape continues to evolve, CachyOS is poised to remain at the forefront of innovation, continually refining its Proton fork and optimizing the Linux gaming experience. Share your thoughts on this update and your experiences with CachyOS in the comments below.
