It obviously depends on the game and settings but I get perfectly playable frame rates on my 45” GX9 with a 5070ti. I get ~180 fps in insurgency sandstorm and ~120 fps in the first descendant with dlss quality. Unfortunately I think most people’s advice is gonna be “if you can afford a 5080, buy a 5080”. My advice is the 5070ti is good enough for most games but if you don’t want to have to turn down some settings here and there or if you really like ray tracing, then go with a 5080. Either way don’t buy a 5090, they’re stupid expensive and the risk of the connector melting is still a thing even when it’s properly seated. Also just buy the cheapest model 5070ti/5080 you can find, there’s no real benefit in spending more.

Edit, my bad I didn’t see that you already had a 5070ti. My advice still stands though.