for what resolution like for gta 5 at 4k ultra settings including 4xmsaa then getting 3 way sli is good but if you want to turn aa then 2 way sli performs good but in some games like witcher 3 and dying light with aa on 2 way sli with gpu overclocked to 1500 or 1600mhz it will give 60 fps above in windows but i will prefer 2 way titan x sli because they cost the same as 3 way gtx 980 ti