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OptiScaler Activates FSR 4 Under Vulkan Before AMD Itself Delivers

OptiScaler’s test build 0.9.0‑pre10 adds FSR 4 support to Vulkan games by routing the upscaler through a DirectX 12 bridge, effectively bypassing AMD’s official limitation to RDNA 4 GPUs and DX12 titles. The community‑driven implementation works in titles such as Doom: The Dark Ages and Indiana Jones and the Great Circle, delivering measurable image‑quality gains over FSR 3.1. AMD has not provided native Vulkan or INT8 driver support, making the OptiScaler hack a strategic signal. The move highlights a gap between AMD’s product roadmap and open‑source expectations.