FSR is really cool, but I can't see how it would be very useful for emulation. DOS games that can run through nglide or dgvoodoo 2 aren't hard to run at 4k or whatever resolution you want, and software rendered 3d games aren't eligible at all. The only partially GPU bound emulators I am aware of is Xenia, a Xbox 36o emulator, and I guess the new hardware parrellel n64 plugin. Xenia is pretty shader intensive so maybe it could benefit from FSR, and parrellel just needs a lot of raw grunt to brute force all it's scanlines, which it does through Vulkan, which is probably not a use case where upscaling makes a lot of sense.