I think the main issue is gonna be input latency which is why Nvidia didn't put it on pre-4000. 4090 already is very close to having input latency of Native in some games. Doing frame generation on Ampere let alone Turing might make the input latency too unbearable. 80fps frames with 15fps like input latency.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850