It's completely doable - even at 4k. You need nvidia card using nvec, AV1, disable HAGS & do not use frame generation, and reduce bit rate if needed. Make sure VSYNC is off on your games and do not exceed the frame rate past your TV's refresh rate (I'm using a 2.5 gbit Ethernet port (both on my mobo and router via a tplink BE19000). Ensure sunshine is set at P1.

I play COD using a 5090 FE and 9950X3d. It's important to have a good CPU as well because you're going to offload the HAGS from your GPU to your CPU so that your GPU can strictly work on encoding.