>>715048047The difference is image clarity, especially in motion. I think 2 and 3 are incredibly smudgy or too sharpened, lots ghosting.
FSR 2 and 3 also has a problem DLSS and FSR 4 doesn't, which is that some things just look... pixelated and like they're missing some shader or something. Especially around fog. Main example I've encountered is Darktide's holograms and certain liquid canisters.
FSR 4 is AI based same as DLSS. And it's like between DLSS 3 and 4, and DLSS 3 was already pretty good. And I think it's way less smudgy than DLSS 3 a lot of the time is.
I've had both Nvidia and AMD GPUs.