Depending on what to do with your laptop will determine whether or not you see any difference between using 512MB or 1GB of RAM.
A few do just Web surfing, office applications and playing DVDs then you will probably see no advantage in using 1GB as opposed to 512MB of RAM.

Would RAM affect playing games?

Again, any noticeable difference between 1.6 and 1.8 CPU?

It depends on the games as far as the RAM goes. On high-end games, the RAM will make a much bigger difference than on older games.

The difference between a 1.6 and 1.8 CPU will be negligible for almost any conceivable situation.

Ok, thanks.

i called intell some month back aboout this very same issue, they said nothing recognizable between 1.6 and 1.8, how ever they told me there is a very noticable dif between 1.6 and 2.0