I get why people might want FSR4 on older hardware but if we stop and think about it, what happens if it does work but you get a 15% (random figure) perf loss or greater (game dependent). Would people use it? "Hey, we've back ported this great feature for you but oh yeah you are going to have less performance." Last time I checked people don't want less FPS they want more. Praising Nvidia for releasing DLSS4.5 for working on older models when it means losing on average 5-12% perf (but can be up to 30%). Thanks but no thanks. That's not a good news story.
From my testing FSR 4 on RDNA3 is 10% slower than FSR3, but still faster than native and with a massively better image quality vs FSR3.
To give you an example, RX 7800XT in cyberpunk 1440P with the highest setting and RT on Psycho with FSR4 on balanced its 50 FPS, with Native AA is 23 FPS.
FSR3 is just bad, its really bad, it doesn't need to be bad RDNA3 and 2 are capable of running upscaling tech with image quality just as good as DLSS 3 if not even a little better, IMO AMD were just too lazy to give us proper compute driven upscaling, until now that is and what they are doing is locking behind RDNA4.
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I'm trying to convey that a) it's not as rosy as people make it out, and b) they can change easily vendor if they are not happy with how AMD release updates. It seems that people instead find it easier to post replies to then stir up the usual responses. It's literally the same people every time. And some of the people don't even own an AMD card. They literally just can't help themselves. They must sit shaking at their desk waiting for a reason to post and then exhale as if releasing some inner demon. They need help!