In the comment section of a review by Tim from Hardware Unboxed I saw a person who managed to spoof their GPU on Linux to use FSR4 with RDNA3. Performance was very low (much lower than even native resolution).
So, it does look like it leverages hardware features introduced with RDNA4.
Your post is very confusing. Is this meant to be a tutorial?
I think it would fit in [email protected] or [email protected] more.