fsr 4's algo was enabled on rdna 4 via hardware changes. people will argue that it works on rdna 2 & 3 via a leaked int8 path, often leaving out that:

• it's not identical in terms of visual quality (even though it does often improve upon 3.X)
• most critically, it doesn't generally offer the same level of perf uplift to make it worthwhile (though there are a handful of very good cases)

I suppose I'm kind of opinionated about the whole upscaling and mfg 'meta' of (mostly) pc gaming today, but I find it sad that this is what end users clamour for, rather than for games to just not run like shit to begin with.