AMD FSR 4 Runs on Radeon RX 470, But GCN 4 Limits Performance

A community member has successfully enabled AMD's FSR 4 upscaling technology on the older Radeon RX 470 graphics card. This experiment matters because it proves that modern software enhancements can breathe new life into aging hardware that officially lacks support. Buyers with legacy GPUs now have a technical path to improve frame rates without purchasing new components.

Community experiment proves legacy GPU support but highlights architectural inefficiencies

The project targets the AMD Radeon RX 470, which relies on the fourth-generation Graphics Core Next (GCN) architecture. The enthusiast ran this configuration on a Linux operating system, which required significant custom modifications to the software stack. Specifically, the setup needed patches for the VKD3D translator and the open-source RADV graphics driver to function.

Testing at a resolution of 1920×1080 pixels (FHD) yielded approximately 37 frames per second with a frame time of roughly 15 milliseconds. The GCN 4 architecture lacks native DP4a support, forcing the system to use slower 24-bit integer operations instead of the preferred 8-bit calculations. This architectural limitation causes a noticeable performance penalty compared to newer hardware designs.

For comparison, Intel's XeSS technology achieved a faster frame time of approximately 13 milliseconds in the same test environment. The author is currently exploring a frame interleaving strategy that alternates between FSR 4 quality and FSR 3 performance to optimize the output. Community feedback suggests the effort may not be worth the result due to the heavy computational cost on GCN 4 chips.

The experiment demonstrates that while FSR 4 can run on older AMD hardware, the performance gains are heavily constrained by the underlying GPU architecture. Users attempting this setup must be prepared for complex driver modifications and potential inefficiencies. The project highlights the ongoing community effort to extend the lifespan of legacy graphics cards through software innovation.