The Motherboard is the Key.
If you you have a PCI-E x3 motherboard you will not benefit the powerfull that PCI-E x4 Nvidia 3000 /4000 series use.
I have a 10700 (non K) paired with a 2060 super My MB is PCI-E x3 so I think is not worth to change only the GPU by 3000 or 4000 series without upgrading my MB and CPU. Maybe I’m wrong but I dont belive in miracles.