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AMD says FSR 4 doesn't work on old GPUs, but I forced it on anyway

AMD's FSR 4 is fantastic, but there's a big problem with it. It's only supported on two — count 'em, two — graphics cards right now. Despite being available in over 65 games, you can only use FSR 4 on ...
eTeknix

AMD FSR 4 Now Available for Many Games Thanks to FSR 3.1 Compatibility

According to leaks from @Kepler_L2 (thanks VideoCardz), FSR 4 is built upon FSR 3.1, ensuring compatibility with all games currently supporting that version. This is promising for users purchasing AMD ...
HotHardware

AMD FSR 4 Running On Radeon RX 6800 XT Gives Image Quality A Boost But At A Big Cost

Since the AMD FSR 4 INT8 DLL leak, we've known that it's possible to use FSR 4 on older GPU architectures than RDNA 4. Recently, we've actually seen successful use of FSR 4 on AMD's RDNA 2 ...
TweakTown

FSR 4 running on a Radeon RX 7900 XTX is possible, but performance takes a big hit

TL;DR: AMD's AI-powered FSR 4 significantly enhances upscaling image quality, rivaling NVIDIA DLSS. However, due to FP8-capable AI hardware requirements, it is exclusive to the RDNA 4 Radeon RX 9000 ...