FSR 3 looks to be driver bound, so no FSR 3 for non AMD cards, also no info yet on if this will be locked to RDNA3+ only.
Edit* Seen it's been mentioned lol.
It makes sense, they need a win on their side. If it worked on any card like FSR2.x, then people would just not bother buying an RDNA 3 card because Nvidia's cards are superior in terms of features available in bot consumer and professional space, as well as drivers and support across the board.
With FSR being driver level, this means AMD know that if it's good, then people will jump to AMD for the slightly cheaper pricing vs Nvidia for the higher end cards and benefit from FSR 3, especially if it's inputting a frame ratio between real frame vs Nvidia's single frame insertion. So technically AMD's FSR3 should yield greater framerates than DLSS3's frame gen.
We also don't know what tricks Nvidia has, they could also unlock additional frames in a future driver release that does the same. If AMD can do it via driver alone since they have no dedicated hardware for it, then so can Nvidia and bolster it with the hardware doing all the work.
I be interested to know how many people use fsr as based on my own experience and others on Reddit etc. very few actually use it unless there really is no other choice:
fc 6 - had to use it at 4k due to lack of grunt, was meh for 1440p but thankfully fps was good
re games - meh, thankfully performance was great at 4k and 1440 so need for it
riftbreaker - meh, thankfully performance was great at 4k and 1440 so need for it
Problem with amd is... Even if this is great and on par with Nvidias, the uptake is probably going to suck for a good while.
I'll be amazed if their latency is as good as nvidias too, especially if adding more than 1 frame....