sorry for the above reply,ignore it. I told that I won't be using anything more than 2GB. So what is the need for that extra 6GB of RAM? Will it improve performance? How?
Unless you only plan on using your computer for Microsoft Office or Minesweeper or something like casual internet browsing you will use more than 2 GBs of RAM. If you need more than that, it will improve performance. If you have more than you will ever need, it won't make your computer any faster.
That's why it's recommended to get 8 GB as it's the sweet spot.