Depends on the games you play and the settings. You can look up reviews of graphics cards to see how X GPU performance at one resolution or another.
So if you look at an article like this:
Our ASUS RX 5700 XT TUF EVO review takes a look at the new cooler design, which fixes the memory temperature problem of the original TUF without the "EVO". The card is very solid and runs quietly with excellent GPU temperatures and idle-fan stop.
, remember that resolution is a setting too. In terms of the performance cost, but also the fidelity.
You'll see that if a 2070 Super gives ~133 fps in Witcher 3 on ultra at 1080p, the performance goes to 100fps in 1440p at the same settings.
But, the higher resolution can let you get away with, for instance, a bit less anti-aliasing, or you might choose to tone down some other settings, while still getting better fidelity overall. So the drop might not be even less than any benchmarks you look up show.