Hey, I just upgraded from a 2080ti, to a 4070ti.
My fps basically hasn't improved, I've fiddled about with Nvidia control panel and in game settings.
I mainly play arena breakout infinite.
I play at 1440p.
It's connected with a single cable with two pcie connectors. I know you aren't meant to but from what I've googled, it doesn't look like thats the reason its underperforming.
I ran a benchmark and it seems to have scored okay.