OptiScaler Enables FSR 4 On RDNA2 GPUs

OptiScaler's unofficial community build (4.0.2b) now injects AMD's FSR 4 upscaler on RDNA 2 GPUs with current AMD drivers, removing the need to revert to older drivers. The update also reduces ghosting on RDNA 2, adds Vulkan game support, and may improve FSR4 INT8 performance on NVIDIA; the build is currently distributed via OptiScaler's Discord.
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