How much video ram would be needed to play at the highest settings that are available for this resolution-1680x1050. I realize you need a fast pc as well, but I am concerned about the video card memory at the moment. I realize this will not be the highest in-game settings. I am looking at a 2gb 4870 right now, but I am wondering if the 1gb would do. I will be using an awful lot of mods when playing the game.