I still use a 2GB card for gaming (HD7870XT) and I have found in the few more modern tittles I play, like Forza, it can start to cause mad stuttering and stuff after a point, to a degree where now I sometimes have to turn the render resolution down from 1080p. I guess if all you play are DX9 kinda titles though, maybe some esports games and stuff, MOBAs, CSGO and such, or I guess even well optimised titles like GTAV, you won't have an issue, but yeah you'd have to give a lot of consideration about what games you play buying a card like that today.