Well my friend, honestly it's not really a big deal. The main thing that I found to be the big deal is the Hard Drive.
I used to have the white Macbook but at the beginning of this year, I got the latest Aluminium Macbook with the upgrades to 4Gb RAM DDR3 and 320Gb 7200rpm Hard drive at first. The performance was around 10 to 20 percent faster compared to the white Macbook.
But nowadays, I have a 256Gb Solid State Drive as Hard Drive, and it's now freaking fast, my Macbook is super fast and almost instant, the performance difference is now around 50 to 80 percent. I would say that putting a Solid State Drive in your PC, Mac or whatever, will surprise you how fast your computer could be ;-)