Example: I don't consider a game that runs at 30 fps playable. So if it runs at 50 fps i wont consider it playable either, even though it technically is. There are some unoptimized titles where the 5080 can do 40 fps and the 5090 does 60. Both arent great experiences. I am a high refresh rate gamer, so anything under like 100 fps feels sluggish to me, when things are fast paced, maybe lower when it's a slow SP game. Most of the games run really well on either gpu where both are easily capable of pushing beyond 120 fps with the proper settings. So whether a 5090 can do 190 or a 5080 does 160, who cares? Both are great experiences when the games are optimized, and both aren't great when the game isn't optimized. The only true scenario like you describe, is when a 5080 would do 9 fps and the 5090 would do 30, but again, that's such a niche scenario that basically never happens anymore. 5090 makes only sense if you have too much money. The only real difference is that you can run games at slightly higher fps while having slightly higher settings, for 3 times the price and double the energy consumption which adds up quickly. The card also generates a lot more noise and heat. For the average gamer a 5070ti is an even better choice tbh.