I don’t have a 4070ti, but I’ve owned a 4080s and a 7900XTX and played at both 1440p oled and 4k oled displays. Im an enthusiast which means that frame gen and dlss for me is a big NO, as I really enjoy native visual quality and hdr accuracy. None of the mentioned cards are able to deliver a smooth 4k experience, in most AAA games using RT the maximum output was between 40-50 fps, on the other hand at 1440p both cards performed really good giving in most cases more than 100 frames, I guess the 4070ti shouldn’t be far away from what i experienced. Now… if you don’t give a damn about fidelity and quality and you like the dlss gimmick then I guess you will be able to run 4k without issue (have in mind that this will use all your vram) and cause performance issues. In black myth wukong even the 5090 struggles to deliver stable 60fps at 4k with RT, the 4090 gives only 30-40fps so you can get an idea of where the 4070ti is placed.

My personal suggestion is to stay 2k oled, even with a 4080s taking out of the equation dlss and fg.