Depends on the game you play and the settings you select. Graphically demanding games like Metro or Mankind can be very taxing for 3 x 1440p/240hz, specially with Ray Tracing on. You will need a lot of VRAM for such games. 3090 has plenty of that, so it should be able to handle it. I think 3080 should be able to handle it too, not so sure though.