Dark Comet said:
So 2 GB to 8 GB will not effect the score at all. It will affect my FPS in games though won't it?
2 to 4gb jump can affect in game performance significantly. 8gb, not so much. It will not affect 3dmark score at all, as they use little ram to begin with, unlike real games.
8gb of ram is like an extra wide highway, but few cars using it. If it's not used, you don't benefit from it. Typical programs today, including basically all games, do not use that much ram. It's fine as long as that highway is wide enough to handle the traffic.
There is no harm in 8gb though, other than costing more. Feel free to get it.