Im fine with single GPU . never liked SLI . getting amazing results on 1440p 165hz Gsync display . not into 4K gaming as of now until a single GPU is enoughone 2080ti result is also poor in 4k....use 2 cards....
Bf5 with dxr ultra in 4k gave me 20-23fps
thats why i added another card. now it gives me 40-45fps playable..... & thats 2 x 2080ti + i9 9900k + 64ram @3000mhz platinum! on a raid evo 970pro