Since people are going to ask this question, I'll just proceed to ask first:
Do you need a FSR-compatible GPU (RX400 or newer, GTX1000 or newer) to utilize this feature?
It is not gated in any way. If your GPU can consume the shader, it should work. There are known bugs in some older hw such as kepler when it comes to binding images in compute shaders that may cause visual issues, but for the most part, the code doesn't care what GPU you have.