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2d ago

Leaked FSR 4 INT8 Build Lets Modders Run AMD’s AI Upscaler on Older Radeon and Some GeForce GPUs

An unofficial DLL compiled from AMD’s briefly published source works through OptiScaler on Windows.

AMD
A look at the OptiScaler windows with FSR 4 being used on an RDNA 3 GPU.
Image

Overview

  • The community-compiled FSR 4 INT8 DLL can be injected into games that ship with FSR 3 using OptiScaler, enabling Windows use without the earlier Linux-only hacks.
  • Reports and tests show the workaround running on RDNA 3 and RDNA 2 cards and on select NVIDIA RTX 30-series GPUs, with broad compatibility across DirectX 12, DirectX 11, and Vulkan titles.
  • Image quality is widely described as a clear step up from FSR 3.1 with reduced shimmering and sharper fine detail, and Tom’s Hardware found it superior to Intel XeSS on the DP4a path.
  • The gain comes with a cost, as users and labs measured significantly higher processing time—around triple FSR 3.1 on RDNA 3 and about 4.1 ms to upscale to 4K on an RX 7800 XT—producing single‑digit FPS drops in examples like Cyberpunk 2077.
  • This method remains unofficial and potentially unstable, and AMD has not announced plans to bring FSR 4 support to older GPUs or endorsed these community builds.