I built a new PC using the same 5090 and I’ve gone from a Intel 13900KS (on the previous above tests) to an AMD Ryzen 9 9950X3D now and re-ran the same tests.
The first 720x576 SD RHEA x2 upscale test showed a 2 fps drop to 30fps.
The second 1920x720 HD File - PROTEUS test showed a decent increase to 23fps.
