I would not suggest any upscaling with a 3060ti on 3440x1440. I had the 3060ti same resolution and the sim would ctd when using DLDSR or DSR.
I even tried different drivers and it did the same thing. Make Sure youre not running ultra settings.
I returned my 3060ti for an rx6800. I’m not suggesting you do the same. Lets just say I’m taking a risk buying AMD.
I found 8gb not to be enough at that resolution.