juanjostorreshernndez :
using 1080p monitor resolution the performance diference between 1GB-2GB vram is negligible, however make sure the RAMS came in dual channel kit pack(8GB 2x4GB kit)for better compatible(not single 4GB+ 4GB sigle sticks)
disagree........... the "extra" ram has nothing to do with how many fps you'd be getting at that res, but help make it so there's no stuttering or hitching because there's no where for the textures to go but off the ram on the video card to the cpu/system ram/ hd cache.......... pick one. when the information stays on the card you get smoother game play.