Best settings with a RTX 4090

How does it look? does it look like 15fps? I have a 3080ti and 70fps average. I just got a new machine with faster CPU and 4090 and the dev mode fps reading is 30 and it’s red. HOWEVER… it’s awesome ultra smooth like real life visuals. CLEARLY FAR BETTER than the 70 fps I was getting with the old card. So I figured the FPS display is phoey and turned it off and enjoy my ultimate setup.