On December 10, 2025, AMD officially unveiled the FidelityFX SDK 2.1.0. At the same time, it was made accessible on both the GPUOpen official website and GitHub, catering to Windows 10 and 11 DirectX 12 developers. This particular version stands out as the first publicly - available software package that is fully integrated with the 'Redstone' technology stack, marking the official launch of RDNA 4 neural rendering capabilities.

The key updates in this version encompass the incorporation of four FSR features driven by machine learning: FSR Upscaling 4.0.3 (a version that has undergone continuous iteration and optimization), Frame Generation 4.0 (which is responsible for generating frames), Ray Regeneration 1.0 (a tool for ray - tracing reconstruction), and Radiance Caching (currently in technical preview).

From an architectural perspective, the SDK employs a modular loader (amd_fidelityfx_loader.dll) along with an independent feature DLL structure. This setup allows for direct updates of machine learning models through the Adrenalin driver, facilitating 'zero - patch' game upgrades to incorporate the latest features. Moreover, the official Unreal Engine 5 plugin has been updated in tandem, enabling one - click integration.

Regarding hardware compatibility, the Redstone neural rendering features are exclusive to the RDNA 4 architecture. Only the Radeon RX 9000 series and subsequent models offer full support. Previous - generation graphics cards, such as the RX 7000/6000 series, are limited to supporting FSR 3.1. AMD has stated that it will persist in providing the toolchain under a permissive license in the future. However, the core Redstone machine learning models will still be distributed in precompiled binary form.